JPH11126384A - Magneto-optical record medium and its recording and reproducing method - Google Patents

Magneto-optical record medium and its recording and reproducing method

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Publication number
JPH11126384A
JPH11126384A JP29059997A JP29059997A JPH11126384A JP H11126384 A JPH11126384 A JP H11126384A JP 29059997 A JP29059997 A JP 29059997A JP 29059997 A JP29059997 A JP 29059997A JP H11126384 A JPH11126384 A JP H11126384A
Authority
JP
Japan
Prior art keywords
recording
magneto
film
magnetic
optical recording
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP29059997A
Other languages
Japanese (ja)
Inventor
Katsusuke Shimazaki
勝輔 島崎
Yoshitane Tsuburaya
欣胤 円谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP29059997A priority Critical patent/JPH11126384A/en
Publication of JPH11126384A publication Critical patent/JPH11126384A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To obtain excellent recording characteristics in a small external magnetic field by heating a recording assistant magnetic film to a temp. higher than the transition temp. by irradiation of laser light to cause transition of an antiferromagnetic-ferromagnetic transition magnetic material from antiferromagnetism to ferromagnetism and then recording by magnetization in a recording magnetic field to produce a magnetized state in the magneto-optical recording layer. SOLUTION: This magneto-optical recording medium consists of a combination of recording assistant magnetic films 30, 300 comprising an antiferromagnetic-ferromagnetic transition material with a magneto-optical recording reproducing layer 510. In the saturation magnetization curve of the magnetic film comprising an antiferromagnetic-ferromagnetic transition magnetic material used for the recording assistant magnetic film 30 at a temp. higher than the transition temp. of ferromagnetic perpendicular magnetization or higher than the transition critical temp. of perpendicular magnetization of the magnetized film, the intensity of spontaneous magnetization accompanied with saturation magnetization with a small temp. increase after transition to ferromagnetism drastically changes into the intensity over the coercive force of the magneto-optical recording film. Thus, the magnetic field of spontaneous magnetization of the recording assistant magnetic film 30 acts together with the recording magnetic field of a magnetic head to record recording information signals in the magneto-optical recording film.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、光磁気記録媒体及
びその記録方法に関し、更に詳しくは、磁気ヘッドの記
録磁界出力を低減し、光磁気記録媒体の両面に記録する
ことを可能にし、記録磁区をより微小化して高い記録容
量の光磁気記録媒体とその記録方法を提供することに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording medium and a recording method therefor, and more particularly, to a recording head capable of reducing a recording magnetic field output of a magnetic head and recording on both sides of the magneto-optical recording medium. The present invention relates to providing a magneto-optical recording medium having a high recording capacity by miniaturizing magnetic domains and a recording method thereof.

【０００２】[0002]

【従来の技術】光磁気ヘッドはレーザビームを光磁気記
録媒体に集束照射する対物レンズを保持する光ヘッドと
磁界を印加する電磁コイルとから構成される。従来、対
物レンズとコイルとを光磁気ディスクを間にはさんでこ
の両側に配してなる構成の光磁気ヘッドであった。この
構成の光磁気ヘッドでは光磁気ディスクの片面にのみ記
録する方式であるので、一枚の光磁気ディスクの記録密
度を向上させる多くの提案がされている。2. Description of the Related Art A magneto-optical head comprises an optical head for holding an objective lens for converging and irradiating a laser beam onto a magneto-optical recording medium, and an electromagnetic coil for applying a magnetic field. Conventionally, a magneto-optical head has a configuration in which an objective lens and a coil are disposed on both sides of a magneto-optical disk with a magneto-optical disk interposed therebetween. In the magneto-optical head having this configuration, recording is performed only on one surface of the magneto-optical disk. Therefore, many proposals have been made to improve the recording density of one magneto-optical disk.

【０００３】図１はこの種の従来の光磁気デイスク記録
再生装置の回路を示す。光磁気ディスク１の片面上部側
に磁気ヘッド４０が配置され、他面下部側に光ヘッドの
プレート４３、対物レンズ４２が配置される。光ヘッド
は例えば図２の４１で示すもので対物レンズ４２、対物
レンズホルダー４２１、フオカシングアクチュエーター
４２２、トラッキングアクチュエーター４２３等から構
成される。光ヘッド４１と磁気ヘッド４０とは同一中心
線上に配置されて可動する。図１で示すように、光、磁
気各ヘッドは半導体レーザ６７からのレーザビームがＡ
Ｏ変調器６８によって変調され、光磁気ディスクの片面
から記録層へフオカシング照射して記録層を加熱し、同
時に光磁気ディスクの反対側面から磁界変調記録信号が
磁気ヘッド４０から加えられて加熱した記録層に記録磁
区が形成される。FIG. 1 shows a circuit of such a conventional magneto-optical disk recording / reproducing apparatus. A magnetic head 40 is arranged on the upper side of one surface of the magneto-optical disk 1, and a plate 43 and an objective lens 42 of the optical head are arranged on the lower side of the other surface. The optical head is, for example, indicated by 41 in FIG. 2 and includes an objective lens 42, an objective lens holder 421, a focusing actuator 422, a tracking actuator 423, and the like. The optical head 41 and the magnetic head 40 are arranged on the same center line and move. As shown in FIG. 1, the laser beam from the semiconductor laser 67 is A
The recording is modulated by the O modulator 68, and the recording layer is heated by irradiating the focusing layer from one side of the magneto-optical disk to the recording layer, and at the same time, a magnetic field modulation recording signal is applied from the magnetic head 40 from the opposite side of the magneto-optical disk and heated. Recording domains are formed in the layer.

【０００４】上記従来の光磁気ヘッドでは光磁気ディス
クの片面しか利用できず、一枚の光磁気ディスクに記録
できる記録容量が制限されている。そこで、光磁気ディ
スクの両面を記録面として利用できるようにするための
光磁気ヘッドが提案されている。その例として図３に示
すように、光磁気ヘッド４１１には光ヘッドに磁気ヘッ
ドコイル４０が組み込まれており、光磁気ディスクの単
面で記録再生が可能になる。In the above-mentioned conventional magneto-optical head, only one side of the magneto-optical disk can be used, and the recording capacity that can be recorded on one magneto-optical disk is limited. Therefore, a magneto-optical head has been proposed for making both sides of the magneto-optical disk usable as recording surfaces. As an example, as shown in FIG. 3, the magneto-optical head 411 incorporates the magnetic head coil 40 in the optical head, and enables recording and reproduction on a single surface of the magneto-optical disk.

【０００５】一方、光磁気記録媒体及びレーザビームを
利用する磁気ハードデイスク等は記録情報の書き換えが
可能であり、情報の記録密度を飛躍的に大きくできる可
能性があり、光ヘッドにＳＩＬ（ソリッドイマージョン
レンズ）を用いる提案が行われている。この種のヘッド
には光ヘッドと磁気ヘッドとが、それらの間に光磁気デ
イスクを挟んで、その光磁気デイスクの両側に配して用
いる構成の記録再生装置と、光磁気デイスクの片面に光
磁気ヘッドを配置して、光磁気デイスクの両面に記録再
生が可能な記録再生装置とがある。この種の光ヘッド、
或いは光磁気ヘッドはＳＩＬを組み合わせて用いられ
る。On the other hand, a magneto-optical recording medium and a magnetic hard disk using a laser beam can rewrite recorded information, and the recording density of information can be greatly increased. Lens) has been proposed. In this type of head, an optical head and a magnetic head have a magneto-optical disc sandwiched between them, and a recording / reproducing apparatus configured to be used on both sides of the magneto-optical disc. There is a recording / reproducing apparatus in which a magnetic head is arranged and recording / reproducing is possible on both sides of a magneto-optical disc. This kind of optical head,
Alternatively, the magneto-optical head is used in combination with SIL.

【０００６】一方装置のコンパクト化が高スピードで進
展しており、その中でより一層の高密度記録と再生技
術、及び高記録容量化には、微小化記録ピットを低い外
部磁界によって高い記録感度が得られる記録手段が問題
になり、さらに記録磁区信号の状態については、高い解
像度の再生信号が得られる記録特性についての問題があ
る。On the other hand, the compactness of the device is progressing at a high speed. In order to achieve higher density recording and reproduction technology and higher recording capacity, miniaturized recording pits have a higher recording sensitivity by a low external magnetic field. However, there is a problem in the recording means for obtaining a high-resolution reproduction signal with respect to the state of the recording magnetic domain signal.

【０００７】[0007]

【発明が解決しようとする課題】ところで、光磁気ディ
スクの両面を記録面として利用するための光磁気ヘッド
では中心部にレーザビームの光路空隙と対物レンズ等の
光ヘッド部を配置し、その外周部に磁気ヘッドコイル等
を配置する構成である。このため光磁気記録膜のレーザ
ビームスポット照射点に加える磁界の磁束密度が小さく
なるのでこれを高めるためには強度の大きな磁界を用い
る必要がある。しかし形状を極限まで小型化する必要の
ある光磁気ヘッドによって磁界の強度をより大きくする
ことが困難である。In a magneto-optical head for utilizing both surfaces of a magneto-optical disk as recording surfaces, an optical path gap for a laser beam and an optical head such as an objective lens are disposed at the center, and the outer periphery thereof is provided. This is a configuration in which a magnetic head coil and the like are arranged in a section. For this reason, the magnetic flux density of the magnetic field applied to the laser beam spot irradiation point of the magneto-optical recording film becomes small. Therefore, it is necessary to use a strong magnetic field to increase the magnetic flux density. However, it is difficult to further increase the strength of the magnetic field by a magneto-optical head that needs to be miniaturized to the limit.

【０００８】一方、光磁気ディスクの記録再生装置のコ
ンパクト化が高スピードで進展して、高密度記録と再生
及び高容量の記録のために、記録ピット或いは記録磁区
が微小化しており、この微小化記録磁区を低い外部磁界
によって高い記録感度で優れた記録特性を得るための記
録手段が課題である。On the other hand, the compactness of a recording / reproducing apparatus for a magneto-optical disk has been developed at a high speed, and recording pits or recording magnetic domains have been miniaturized for high-density recording, reproduction, and high-capacity recording. There is a need for a recording means for obtaining excellent recording characteristics with high recording sensitivity by using a low external magnetic field in a structured recording magnetic domain.

【０００９】さらに記録された微小記録磁区から、高い
解像度の再生信号を得る再生手段についても課題があ
る。さらにまた、書き換えが可能な光磁気記録媒体及び
レーザビームを利用する磁気ハードデイスク等の記録密
度を飛躍的に大きくするために提案されている、ＳＩＬ
（ソリッドイマージョンレンズ）を光磁気ヘッド、或い
は光ヘッドに組み込んで用いる場合に、実用可能なヘッ
ドにするための構造と構成を改良しなければならない課
題があり、この光磁気ヘッド、或いは光ヘッドによって
高密度及び高容量の記録再生を行うためには、光磁気デ
イスクの構造と記録膜構成と膜材料について改良が課題
である。Further, there is a problem in a reproducing means for obtaining a high-resolution reproduction signal from the recorded minute recording magnetic domain. Furthermore, SIL has been proposed to dramatically increase the recording density of a rewritable magneto-optical recording medium and a magnetic hard disk using a laser beam.
When the (solid immersion lens) is used by incorporating it into a magneto-optical head or an optical head, there is a problem that the structure and configuration for making the head practical can be improved. In order to perform high-density and high-capacity recording / reproduction, it is necessary to improve the structure of the magneto-optical disk, the configuration of the recording film, and the material of the film.

【００１０】[0010]

【課題を解決するための手段】本発明は図２に示すよう
に、光ヘッド４１と磁気ヘッド４０を各々別体で光磁気
記録媒体１１１を挟んで配置して記録再生する片面記録
方式の光磁気デイスク及び記録再生装置において要請さ
れている、記録再生レーザビームと記録磁界の低パワー
化に応えることが可能な新規な光磁気デイスク及び磁気
デイスクに関する。According to the present invention, as shown in FIG. 2, an optical head 41 and a magnetic head 40 are arranged separately with a magneto-optical recording medium 111 interposed therebetween, and a single-sided recording system for recording and reproducing is used. The present invention relates to a novel magneto-optical disk and a magnetic disk which can respond to a reduction in power of a recording / reproducing laser beam and a recording magnetic field required for a magnetic disk and a recording / reproducing apparatus.

【００１１】本発明はまた、図３に例示されるような、
光ヘッドに磁気ヘッドコイル４０１を組み込んで一体化
した光磁気ヘッド４１３によって記録媒体の両面に記録
再生を行うことを可能にするための光磁気デイスク１１
１として、低出力の記録再生レーザービーム及び低出力
の記録磁界である光磁気ヘッド４１３によって両面の記
録再生が可能になる新規な光磁気デイスク或いは磁気デ
イスクに関する。[0011] The present invention also provides a method as illustrated in FIG.
A magneto-optical disk 11 for enabling recording and reproduction on both sides of a recording medium by a magneto-optical head 413 in which a magnetic head coil 401 is integrated into an optical head.
The present invention relates to a novel magneto-optical disk or a magnetic disk in which recording and reproduction can be performed on both sides by a low-output recording / reproducing laser beam and a magneto-optical head 413 having a low-output recording magnetic field.

【００１２】本発明はさらにまた，図４で例示するよう
な、光ヘッド４１０と磁気ヘッド４０との間に記録媒体
を挟んで記録再生を行う方式の記録再生装置に、光ヘッ
ド４１０にＳＩＬ４１２を組み込んだものを用い、且つ
該光ヘッド４１０の記録レーザービーム或いは／及び前
記磁気ヘッド４０の記録磁界が低出力であるために従来
の光磁気デイスク１１１、或いは磁気デイスクでは記録
再生することができない装置を用いて記録再生が行える
新規な光磁気デイスク或いは磁気デイスクに関する。The present invention further relates to a recording / reproducing apparatus of the type which performs recording / reproducing by interposing a recording medium between an optical head 410 and a magnetic head 40 as shown in FIG. A device that cannot use a conventional magneto-optical disk 111 or a magnetic disk to perform recording and reproduction due to the use of the built-in type and the low output power of the recording laser beam of the optical head 410 and / or the recording magnetic field of the magnetic head 40. The present invention relates to a novel magneto-optical disk or a magnetic disk capable of recording and reproducing by using the optical disk.

【００１３】本発明はさらにまた、図５に例示されるよ
うな、光ヘッドに磁気ヘッドコイル４２４及びＳＩＬ４
１２を組み込んだ光磁気ヘッド４１４によって記録媒体
の両面に記録再生を行うことのできる新規な光磁気デイ
スク或いは磁気デイスクに関する。The present invention further provides a magnetic head coil 424 and an SIL4 as shown in FIG.
The present invention relates to a novel magneto-optical disk or a magnetic disk capable of performing recording and reproduction on both sides of a recording medium by a magneto-optical head 414 incorporating the same.

【００１４】本発明の第１は、本発明の新規な光磁気デ
イスク、或いは磁気デイスクは光磁気記録膜或いは磁気
記録膜に情報ビットの記録磁区信号を記録するために必
要な記録磁界の強度について外部磁界（磁気ヘッドから
の低い記録磁界）を補う働きをする記録用補助磁化膜
（キャッピング膜またはキャッピング層と略記する）
を、前記光磁気記録膜或いは磁気記録膜の表裏両面の少
なくとも片方の面に形成することに特徴がある。A first aspect of the present invention is that the novel magneto-optical disk or the magnetic disk of the present invention relates to the strength of a recording magnetic field necessary for recording a recording magnetic domain signal of information bits on a magneto-optical recording film or a magnetic recording film. Auxiliary magnetic film for recording that supplements the external magnetic field (low recording magnetic field from the magnetic head) (abbreviated as capping film or capping layer)
Is formed on at least one of the front and back surfaces of the magneto-optical recording film or the magnetic recording film.

【００１５】本発明の第２は、さらに、本発明の新規な
光磁気デイスク、或いは磁気デイスクに用いる前記記録
磁界補助磁化膜（キャッピング膜またはキャッピング層
と略記する）の磁性材料に常温では面内磁化であり、記
録用レーザビームによって臨界温度Ｔcr以上に加熱され
ると垂直磁化に転移する磁性材料を用いることに特徴が
ある。A second aspect of the present invention is that the magnetic material of the recording magnetic field auxiliary magnetization film (abbreviated as a capping film or a capping layer) used for the novel magneto-optical disk or the magnetic disk of the present invention is in-plane at room temperature. It is magnetization, and is characterized by using a magnetic material that changes to perpendicular magnetization when heated above the critical temperature Tcr by a recording laser beam.

【００１６】本発明の第３は、本発明の新規な光磁気デ
イスク、或いは磁気デイスクに用いる前記キャッピング
膜の磁性材料に常温では反強磁性であり、記録用レーザ
ビームによって転移温度Ｔat以上に加熱されると強磁性
の垂直磁化に転移する反強磁性強磁性遷移磁性材料を用
いることに特徴がある。A third aspect of the present invention is that the magnetic material of the capping film used for the novel magneto-optical disk or magnetic disk of the present invention is antiferromagnetic at room temperature, and is heated to a transition temperature Tat or higher by a recording laser beam. It is characterized by using an antiferromagnetic ferromagnetic transition magnetic material that changes to ferromagnetic perpendicular magnetization when it is performed.

【００１７】本発明の第４は、本発明の新規な光磁気デ
イスク、或いは磁気デイスクに用いる前記キャッピング
膜が光磁気記録膜或いは磁気記録膜の記録用レーザビー
ム入射側面とは反対側の面に形成することに特徴があ
る。A fourth aspect of the present invention is that the capping film used for the novel magneto-optical disk or the magnetic disk of the present invention is provided on the surface of the magneto-optical recording film or the magnetic recording film opposite to the recording laser beam incident side. It is characterized by forming.

【００１８】本発明の第５は、本発明の新規な光磁気デ
イスク、或いは磁気デイスクに用いる前記キャッピング
膜を光磁気記録膜或いは磁気記録膜の記録用レーザビー
ム入射側面に形成することに特徴がある。A fifth feature of the present invention is that the novel magneto-optical disk of the present invention or the capping film used for the magnetic disk is formed on the magneto-optical recording film or the recording laser beam incident side surface of the magnetic recording film. is there.

【００１９】本発明の第６は、本発明の新規な光磁気デ
イスク、或いは磁気デイスクに用いる前記キャッピング
膜が光磁気記録膜或いは磁気記録膜の表裏両面に形成す
ることに特徴がある。A sixth aspect of the present invention is characterized in that the capping film used for the novel magneto-optical disk or the magnetic disk of the present invention is formed on both front and back surfaces of a magneto-optical recording film or a magnetic recording film.

【００２０】本発明の第７は、本発明の新規な光磁気デ
イスク、或いは磁気デイスクが、光磁気記録膜或いは磁
気記録膜の表裏両面の少なくとも片方の面にキャッピン
グ膜を形成すると共に前記光磁気記録膜或いは前記磁気
記録膜の記録用レーザビーム入射側に他の補助磁化膜と
して少なくとも再生用磁性膜を形成することに特徴があ
る。A seventh aspect of the present invention is that the novel magneto-optical disk or magnetic disk of the present invention forms a capping film on at least one of the front and back surfaces of a magneto-optical recording film or a magnetic recording film, and the magneto-optical recording medium further comprises: It is characterized in that at least a reproducing magnetic film is formed as another auxiliary magnetization film on the recording film or the recording laser beam incident side of the magnetic recording film.

【００２１】本発明の第８は、本発明の新規な光磁気デ
イスク、或いは磁気デイスクが、記録用レーザビームの
照射によって光磁気記録膜或いは磁気記録膜に記録磁区
信号を記録すると共に前記光磁気デイスク、或いは磁気
デイスクに形成される他の補助磁化膜の少なくとも再生
用磁性膜に前記光磁気記録膜或いは磁気記録膜の記録磁
区信号が転写される、そのような磁性材料を他の補助磁
化膜に用いることに特徴がある。An eighth aspect of the present invention is that the novel magneto-optical disk or the magnetic disk of the present invention records a magnetic domain signal on a magneto-optical recording film or a magnetic recording film by irradiating a recording laser beam. A magnetic domain film signal of the magneto-optical recording film or the magnetic recording film is transferred to at least the reproducing magnetic film of the disk or another auxiliary magnetic film formed on the magnetic disk. The feature is that it is used for

【００２２】本発明の第２及び第３に用いられるキャッ
ピング膜は記録用レーザビームの照射と外部の記録磁界
を受けて転移温度以上に達した部分において記録磁化し
た転移強磁性に関する飽和磁化の磁界を生成して、光磁
気記録膜或いは磁気記録膜に記録信号を記録させる記録
磁界透過の窓口を形成することに特徴がある。The capping film used in the second and third aspects of the present invention receives a recording laser beam and receives an external recording magnetic field, and has a magnetic field of saturation magnetization related to transition ferromagnetism that has been recorded and magnetized in a portion that has reached a transition temperature or higher. And forming a recording magnetic field transmission window for recording a recording signal on the magneto-optical recording film or the magnetic recording film.

【００２３】さらに本発明の第２及び第３に用いられる
キャッピング膜は記録用レーザビームの照射と外部の記
録磁界を受けて転移温度以上に達した部分以外の部分に
おいては光磁気記録膜或いは磁気記録膜に対する外部磁
界の影響を遮断することに特徴がある。Further, the capping film used in the second and third embodiments of the present invention is a magneto-optical recording film or a magnetic recording film except for a portion which has reached a transition temperature or more due to irradiation of a recording laser beam and an external recording magnetic field. It is characterized in that the influence of an external magnetic field on the recording film is cut off.

【００２４】さらに本発明の第２及び第３のキャッピン
グ膜に用いられる磁性材料は常温以上の温度で、好まし
くは５０℃以上の温度で強磁性垂直磁化に転移し、５５
℃以上の温度で、好ましくは８０℃以上の温度で光磁気
記録膜或いは磁気記録膜の保磁力（Ｏe）よりも強い自
発磁化を発生する磁性材料からなる膜層を光磁気記録膜
層或いは磁気記録膜層と組み合わせて用いることに特徴
がある。Further, the magnetic material used for the second and third capping films of the present invention changes to ferromagnetic perpendicular magnetization at a temperature higher than ordinary temperature, preferably at a temperature higher than 50 ° C.
A film layer made of a magnetic material that generates spontaneous magnetization stronger than the coercive force (Oe) of the magneto-optical recording film or the magnetic recording film at a temperature of 80 ° C. or more, preferably 80 ° C. or more It is characterized in that it is used in combination with a recording film layer.

【００２５】さらに本発明の第２及び第３のキャッピン
グ膜に用いられる磁性材料は記録用レーザビームの照射
による加熱温度で強磁性垂直磁化に転移し、光磁気記録
膜或いは磁気記録膜のキュリー温度（Ｔc）近傍で光磁
気記録膜或いは磁気記録膜の保磁力（Ｏe）よりも強い
磁界を及ぼす飽和磁化を保持する磁性材料からなる膜層
を光磁気記録膜層或いは磁気記録膜層と組み合わせて用
いることに特徴がある。Further, the magnetic material used for the second and third capping films of the present invention is changed to ferromagnetic perpendicular magnetization at the heating temperature by irradiation of the recording laser beam, and the Curie temperature of the magneto-optical recording film or the magnetic recording film. A film layer made of a magnetic material that retains saturation magnetization that gives a magnetic field stronger than the coercive force (Oe) of the magneto-optical recording film or the magnetic recording film near (Tc) is combined with the magneto-optical recording film layer or the magnetic recording film layer There is a feature in using it.

【００２６】本発明の第７及び第８に用いられる他の補
助磁化膜として少なくとも再生用磁性膜には、記録用レ
ーザビームの照射による加熱温度によって光磁気記録膜
或いは磁気記録膜に記録磁区信号が記録される際に同時
に記録磁区信号が転写される磁性材料を光磁気記録膜層
或いは磁気記録膜層と組み合わせて用いることに特徴が
ある。As another auxiliary magnetic film used in the seventh and eighth aspects of the present invention, at least the reproducing magnetic film has a recording magnetic domain signal on the magneto-optical recording film or the magnetic recording film depending on a heating temperature by irradiation of a recording laser beam. It is characterized in that a magnetic material to which a recording magnetic domain signal is transferred at the same time as recording is used in combination with a magneto-optical recording film layer or a magnetic recording film layer.

【００２７】本発明の第９は、少なくとも光磁気記録層
を有する光磁気記録媒体において、反強磁性強磁性遷移
磁性材料からなる記録用補助磁性膜を積層構成し、前記
光磁気記録媒体に記録用レーザ光を照射することによっ
て前記記録用補助磁性膜を転移温度以上に加熱されて反
強磁性強磁性遷移磁性材料を反強磁性から強磁性へ転移
し、記録磁界下で記録磁化し、ついで前記光磁気記録層
に記録磁化を生成させることによって記録されることに
特徴がある。According to a ninth aspect of the present invention, in a magneto-optical recording medium having at least a magneto-optical recording layer, a recording auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition magnetic material is laminated, and recording is performed on the magneto-optical recording medium. The recording auxiliary magnetic film is heated to a transition temperature or higher by irradiating the recording auxiliary magnetic film to a transition temperature from the antiferromagnetic ferromagnetic transition magnetic material to the ferromagnetic, and recording magnetization is performed under a recording magnetic field. It is characterized in that recording is performed by generating recording magnetization in the magneto-optical recording layer.

【００２８】本発明の第１０は、少なくとも光磁気記録
層を有する光磁気記録媒体において、常温以上の温度で
垂直磁化に転移する磁性材料からなる記録用補助磁性膜
を積層構成し、前記光磁気記録媒体に記録用レーザ光を
照射することによって前記記録用補助磁性膜を転移温度
以上に加熱して垂直磁化に転移し、記録磁界下で記録磁
化し、ついで前記光磁気記録層に記録磁化を生成させる
ことによって記録されることに特徴がある。According to a tenth aspect of the present invention, in a magneto-optical recording medium having at least a magneto-optical recording layer, a recording auxiliary magnetic film made of a magnetic material that transitions to perpendicular magnetization at a temperature equal to or higher than room temperature is laminated. By irradiating a recording medium with a recording laser beam, the auxiliary recording magnetic film for recording is heated to a transition temperature or higher and transitions to perpendicular magnetization, recording magnetization is performed under a recording magnetic field, and then the recording magnetization is applied to the magneto-optical recording layer. It is characterized by being recorded by being generated.

【００２９】本発明の第１１は、少なくとも光磁気記録
膜を有する光磁気記録媒体において、該光磁気記録膜の
両面の少なくとも片方の面側に反強磁性強磁性遷移磁性
材料からなる記録用補助磁性膜を積層構成し、前記光磁
気記録媒体に記録用レーザ光を照射することによって前
記記録用補助磁性膜が転移温度以上に加熱されて反強磁
性強磁性遷移磁性材料を反強磁性から強磁性へ転移し、
記録磁界下で記録磁化し、ついで前記光磁気記録層に記
録磁化を生成させることによって記録されることに特徴
がある。According to an eleventh aspect of the present invention, in a magneto-optical recording medium having at least a magneto-optical recording film, at least one of both surfaces of the magneto-optical recording film has a recording auxiliary material made of an antiferromagnetic ferromagnetic transition magnetic material. By irradiating the magneto-optical recording medium with a recording laser beam, the recording auxiliary magnetic film is heated to a transition temperature or higher to change the antiferromagnetic ferromagnetic transition magnetic material from antiferromagnetic to strong. Transition to magnetism,
It is characterized in that recording is performed by recording magnetization under a recording magnetic field, and then recording magnetization is generated in the magneto-optical recording layer.

【００３０】本発明の第１２は、少なくとも光磁気記録
層を有する光磁気記録媒体において、該光磁気記録膜の
両面の少なくとも片方の面側に常温以上の温度で垂直磁
化に転移する磁性材料からなる記録用補助磁性膜を設
け、前記光磁気記録媒体に記録用レーザ光を照射するこ
とによって前記記録用補助磁性膜を転移温度以上に加熱
して垂直磁化に転移し、記録磁界下で記録磁化し、つい
で前記光磁気記録層に記録磁化を生成させることによっ
て記録されることに特徴がある。According to a twelfth aspect of the present invention, in a magneto-optical recording medium having at least a magneto-optical recording layer, at least one of the two surfaces of the magneto-optical recording film is made of a magnetic material which transitions to perpendicular magnetization at a temperature of room temperature or higher. A recording auxiliary magnetic film is provided, and by irradiating a recording laser beam to the magneto-optical recording medium, the recording auxiliary magnetic film is heated to a transition temperature or higher and transitions to perpendicular magnetization. Then, recording is performed by generating recording magnetization in the magneto-optical recording layer.

【００３１】本発明の第１３は、少なくとも光磁気記録
層を有する光磁気記録媒体において、レーザ光の照射に
よって垂直磁化へ転移する磁性材料からなる、再生用磁
性膜と記録用補助磁性膜とを備えることに特徴がある。According to a thirteenth aspect of the present invention, in a magneto-optical recording medium having at least a magneto-optical recording layer, a reproducing magnetic film and a recording auxiliary magnetic film made of a magnetic material which transitions to perpendicular magnetization upon irradiation with a laser beam. There is a feature in preparing.

【００３２】本発明の第１４は、少なくとも光磁気記録
層を有する光磁気記録媒体において、前記光磁気記録層
の記録用レーザ光入射側に常温で面内磁化を示すが臨界
温度Ｔcr1以上で垂直磁化へ転移する材料からなる再生
用磁性膜と転移温度以上で垂直磁化し、記録磁界下で記
録磁化し、ついで前記光磁気記録層に記録磁化を生成さ
せるる記録用補助磁性膜とを備えることに特徴がある。According to a fourteenth aspect of the present invention, in a magneto-optical recording medium having at least a magneto-optical recording layer, an in-plane magnetization is shown at room temperature on a recording laser beam incident side of the magneto-optical recording layer, but is perpendicular at a critical temperature Tcr1 or higher. A reproducing magnetic film made of a material that transitions to magnetization, and a recording auxiliary magnetic film that perpendicularly magnetizes at a transition temperature or higher, performs recording magnetization under a recording magnetic field, and then generates recording magnetization in the magneto-optical recording layer. There is a feature.

【００３３】本発明の第１５は、基板上に少なくとも記
録用磁化膜と再生用磁化膜を備え、記録用レーザ光を照
射することによって記録される光磁気記録媒体おいて、
前記記録用磁化膜の近傍に、記録用レーザ光の照射によ
って加熱されて垂直磁化に転移する記録用補助磁化膜が
形成されることに特徴がある。According to a fifteenth aspect of the present invention, there is provided a magneto-optical recording medium having at least a recording magnetic film and a reproducing magnetic film on a substrate, and recording by irradiating a recording laser beam.
A recording auxiliary magnetic film which is heated by irradiation of a recording laser beam and transitions to perpendicular magnetization is formed in the vicinity of the recording magnetic film.

【００３４】本発明の第１６は、基板上に少なくとも記
録用磁化膜と再生用磁化膜を備え、記録用レーザ光を記
録用磁化膜に照射することによって記録する光磁気記録
媒体おいて、前記記録用磁化膜の近傍に副格子磁化の方
向が常温で膜面に対して垂直である反強磁性強磁性遷移
磁性材料からなる記録用補助磁化膜を形成することに特
徴がある。According to a sixteenth aspect of the present invention, there is provided a magneto-optical recording medium comprising at least a recording magnetic film and a reproducing magnetic film on a substrate, and recording by irradiating the recording magnetic film with a recording laser beam. It is characterized in that a recording auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition magnetic material whose sublattice magnetization is perpendicular to the film surface at room temperature is formed near the recording magnetic film.

【００３５】本発明の第１７は、基板上に少なくとも記
録用磁化膜と再生用磁化膜を備え、記録用レーザ光を記
録用磁性膜に照射することによって記録する光磁気記録
媒体おいて、前記記録用磁化膜の近傍に副格子磁化の方
向が常温で膜面に対して平行である反強磁性強磁性遷移
磁性材料からなる記録用補助磁化膜を形成することに特
徴がある。According to a seventeenth aspect of the present invention, there is provided a magneto-optical recording medium comprising at least a recording magnetic film and a reproducing magnetic film on a substrate, wherein recording is performed by irradiating the recording magnetic film with a recording laser beam. It is characterized in that a recording auxiliary magnetization film made of an antiferromagnetic ferromagnetic transition magnetic material whose sublattice magnetization is parallel to the film surface at room temperature is formed near the recording magnetic film.

【００３６】上記記録用磁化膜と記録用補助磁化膜とは
直接接触しても、前記記録用磁化膜と前記記録用補助磁
化膜との間に非磁性層が介在させてもよい。さらに、光
磁気記録媒体は、レーザ光の照射によって転移温度以上
に加熱されると垂直磁化に転移する補助磁性膜が前記再
生用磁化膜に接触して形成してもよい。The recording magnetic film and the recording auxiliary magnetic film may be in direct contact with each other, or a non-magnetic layer may be interposed between the recording magnetic film and the recording auxiliary magnetic film. Further, in the magneto-optical recording medium, an auxiliary magnetic film which changes to perpendicular magnetization when heated to a transition temperature or higher by irradiation of a laser beam may be formed in contact with the magnetic film for reproduction.

【００３７】またさらに、光磁気記録媒体には、レーザ
光の照射によって転移温度以上に加熱されると垂直磁化
に転移する補助磁性膜が形成されており、該補助磁性膜
は前記再生用磁化膜との間に非磁性層を介在させて用い
てもよい。Further, the magneto-optical recording medium is provided with an auxiliary magnetic film which changes to perpendicular magnetization when heated to a transition temperature or higher by irradiating a laser beam, and the auxiliary magnetic film is formed of the reproducing magnetic film. May be used with a non-magnetic layer interposed therebetween.

【００３８】またさらに、光磁気記録媒体は記録用磁化
膜と再生用磁化膜との間に、レーザ光の照射によって転
移温度以上に加熱されると垂直磁化に転移する補助磁性
膜を形成して用いてもよい。Further, in the magneto-optical recording medium, an auxiliary magnetic film which changes to perpendicular magnetization when heated to a transition temperature or more by irradiation of a laser beam is formed between the recording magnetic film and the reproducing magnetic film. May be used.

【００３９】さらに、非磁性層には光磁気記録媒体に用
いられる光反射膜、断熱性膜、誘電体膜、透明保護膜、
基板材料等の材料から選択して用いてもよい。The non-magnetic layer further includes a light reflecting film, a heat insulating film, a dielectric film, a transparent protective film, and the like used in a magneto-optical recording medium.
A material such as a substrate material may be selected for use.

【００４０】本発明の第１８は、基板上に少なくとも記
録用磁性膜と再生用磁性膜を備え、記録用レーザ光を該
記録用磁性膜に照射することによって記録する光磁気記
録媒体おいて、記録用補助磁性膜、記録用磁性膜、非磁
性材料膜、室温では面内磁化で臨界温度以上で垂直磁化
に転移する第１の補助磁性膜、非磁性材料膜、反強磁性
強磁性遷移磁性材料からなる補助磁性膜、室温では面内
磁化で臨界温度以上で垂直磁化に転移する再生用磁性膜
として機能する第２の補助磁性膜等の膜層を備えると共
に、この順に積層構成されることが特徴である。According to an eighteenth aspect of the present invention, there is provided a magneto-optical recording medium comprising at least a recording magnetic film and a reproducing magnetic film on a substrate, and recording by irradiating the recording magnetic film with a recording laser beam. Recording auxiliary magnetic film, recording magnetic film, non-magnetic material film, first auxiliary magnetic film that transitions to perpendicular magnetization at critical temperature or higher due to in-plane magnetization at room temperature, non-magnetic material film, antiferromagnetic ferromagnetic transition magnetism An auxiliary magnetic film made of a material, and a film layer such as a second auxiliary magnetic film functioning as a reproducing magnetic film that transitions to perpendicular magnetization at a temperature not lower than a critical temperature at room temperature at room temperature, and is laminated in this order. Is the feature.

【００４１】本発明の第１９は、基板上に少なくとも記
録用磁性膜と再生用磁性膜を備え、記録用レーザ光を記
録用磁性膜に照射することによって記録する光磁気記録
媒体おいて、前記記録用磁性膜、非磁性材料膜、室温で
は面内磁化で臨界温度以上で垂直磁化に転移する第１の
補助磁性膜、非磁性材料膜、副格子磁化の方向が常温で
膜面に対して平行であり，再生光の照射によって膜面に
垂直な磁化へ転移する反強磁性強磁性遷移磁性材料から
なる補助磁性膜、室温では面内磁化で臨界温度以上で垂
直磁化に転移する再生用磁性膜として機能する第２の補
助磁性膜等の膜層を備えると共に、この順に積層構成さ
れることが特徴である。According to a nineteenth aspect of the present invention, there is provided a magneto-optical recording medium comprising at least a recording magnetic film and a reproducing magnetic film on a substrate, and recording by irradiating the recording magnetic film with a recording laser beam. Magnetic film for recording, non-magnetic material film, first auxiliary magnetic film which transitions to perpendicular magnetization at critical temperature or higher due to in-plane magnetization at room temperature, non-magnetic material film, direction of sub-lattice magnetization at room temperature relative to film surface Auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition magnetic material that is parallel and transitions to magnetization perpendicular to the film surface upon irradiation with the reproduction light. Reproduction magnetism that transitions to perpendicular magnetization above the critical temperature due to in-plane magnetization at room temperature. It is characterized in that it has a film layer such as a second auxiliary magnetic film functioning as a film and is laminated in this order.

【００４２】次に本発明の記録原理について説明する。
本発明のキャッピング層３０に用いる反強磁性強磁性遷
移磁性材料からなる磁性膜の強磁性垂直磁化転移温度Ｔ
at以上、或いは磁化膜の垂直磁化転移臨界温度Ｔcr1以
上の温度における飽和磁化曲線Ａ，Ｂは、光磁気記録膜
の保磁力の温度変化曲線Ｃとの組み合わせの例によって
図６に示す磁性特性から説明する。反強磁性強磁性遷移
磁性材料からなる磁性膜の曲線Ａは強磁性に転移した後
わずかな温度上昇で飽和磁化に伴う自発磁化の強さが急
激に光磁気記録膜の保磁力を越える強さに変化する。従
ってキャッピング層３０が記録磁界の向きに磁化された
自発磁化の磁界が外部磁気ヘッドの記録磁界と一緒にな
って、記録用レーザビームスポットによる温度が低い、
低パワーの記録用レーザビームで光磁気記録膜に記録情
報信号を記録することができる。Next, the recording principle of the present invention will be described.
The ferromagnetic perpendicular magnetization transition temperature T of the magnetic film made of the antiferromagnetic ferromagnetic transition magnetic material used for the capping layer 30 of the present invention.
The saturation magnetization curves A and B at temperatures equal to or higher than at or the critical temperature Tcr1 of the perpendicular magnetization transition of the magnetic film are obtained from the magnetic characteristics shown in FIG. 6 by an example of a combination with the temperature change curve C of the coercive force of the magneto-optical recording film. explain. Curve A of a magnetic film made of an antiferromagnetic ferromagnetic transition magnetic material shows that the intensity of spontaneous magnetization accompanying saturation magnetization suddenly exceeds the coercive force of a magneto-optical recording film at a slight temperature rise after transition to ferromagnetism. Changes to Therefore, the magnetic field of spontaneous magnetization in which the capping layer 30 is magnetized in the direction of the recording magnetic field is combined with the recording magnetic field of the external magnetic head, and the temperature due to the recording laser beam spot is low.
A recording information signal can be recorded on the magneto-optical recording film with a low-power recording laser beam.

【００４３】磁化膜からなる曲線Ｂは垂直磁化に転移し
た後飽和磁化に伴う自発磁化の強さが、温度の上昇によ
って光磁気記録膜の保磁力を越える強さに変化し、キャ
ッピング層３０が記録磁界の向きに磁化された自発磁化
の磁界が外部磁気ヘッドの記録磁界と一緒になって、光
磁気記録膜の保磁力が零になる温度Ｔc0近傍よりも低い
温度の低パワー記録用レーザビームによって、光磁気記
録膜に情報信号を記録する。キャッピング層３０の磁性
材料のキュリー温度が光磁気記録膜のキュリー温度より
低くても用いることのできる材料もあるが、特にキュリ
ー温度が光磁気記録膜のキュリー温度Ｔc0よりも高いキ
ャッピング層３０の材料では記録用レーザビームの出力
を大きく低減できる。Curve B composed of a magnetic film changes the intensity of spontaneous magnetization accompanying saturation magnetization after transition to perpendicular magnetization to an intensity exceeding the coercive force of the magneto-optical recording film due to an increase in temperature. A low power recording laser beam at a temperature lower than the temperature Tc0 where the coercive force of the magneto-optical recording film becomes zero when the magnetic field of spontaneous magnetization magnetized in the direction of the recording magnetic field is combined with the recording magnetic field of the external magnetic head. Thus, an information signal is recorded on the magneto-optical recording film. Although some materials can be used even if the Curie temperature of the magnetic material of the capping layer 30 is lower than the Curie temperature of the magneto-optical recording film, particularly the material of the capping layer 30 whose Curie temperature is higher than the Curie temperature Tc0 of the magneto-optical recording film. Thus, the output of the recording laser beam can be greatly reduced.

【００４４】図１０は光磁気記録層１０の保護膜７側面
に反強磁性強磁性遷移磁性材料のキャッピング層３０を
設けた膜構成の光磁気記録媒体に光ヘッドの対物レンズ
３０１から記録用レーザービームスポットと磁気ヘッド
４０から記録外部磁界を加えた場合に生成する媒体内積
層膜の温度分布状態についての模式図である。記録用レ
ーザービームのフオカシング部分の中心部分が最も高温
になり、記録用レーザービーム光スポットの外側方向に
低い温度分布であり、記録用レーザービーム光スポット
の最小部分の温度勾配が最も大きくなる。記録用レーザ
ービーム光スポットがフオカシングされる積層膜の再生
用磁性層２４、第１補助磁性層２５、非磁性層２９、反
射層８、光磁気記録層１０、及び反強磁性強磁性遷移磁
性材料のキャッピング層３０等の膜は厚みが極めて薄い
ために、ほぼ同じ温度分布にあり、加熱された各磁性膜
はそれぞれの膜特有の磁気特性に変化する。記録用レー
ザービーム光スポットの中心部分では、光磁気記録層１
０の保磁力が記録情報ビットが形成され程度以下に低下
する温度領域５０２があり、再生用磁性層２４の面内磁
化から垂直磁界へ転移する臨界温度Ｔcr2以上の温度領
域があり、反強磁性強磁性遷移磁性材料のキャッピング
層３０の反強磁性が強磁性に転移して記録情報の磁化信
号を形成すると同時に光磁気記録層１０に対して記録磁
界を発生する飽和磁化を形成する温度領域がある。FIG. 10 shows a recording laser from an objective lens 301 of an optical head on a magneto-optical recording medium having a film structure in which a capping layer 30 of an antiferromagnetic ferromagnetic transition magnetic material is provided on the side of the protective film 7 of the magneto-optical recording layer 10. FIG. 7 is a schematic diagram illustrating a temperature distribution state of a laminated film in a medium generated when a recording external magnetic field is applied from a beam spot and a magnetic head 40. The central portion of the focusing portion of the recording laser beam has the highest temperature, has a low temperature distribution in the outward direction of the recording laser beam light spot, and has the largest temperature gradient at the minimum portion of the recording laser beam light spot. The reproducing magnetic layer 24, the first auxiliary magnetic layer 25, the non-magnetic layer 29, the reflective layer 8, the magneto-optical recording layer 10, and the antiferromagnetic ferromagnetic transition magnetic material of the laminated film in which the recording laser beam light spot is focused. Since the films such as the capping layer 30 are extremely thin, they have substantially the same temperature distribution, and each heated magnetic film changes to magnetic characteristics unique to the film. At the center of the recording laser beam light spot, the magneto-optical recording layer 1
There is a temperature region 502 where the coercive force of 0 drops below the level at which recording information bits are formed, a temperature region above the critical temperature Tcr2 at which the in-plane magnetization of the reproducing magnetic layer 24 transitions to a perpendicular magnetic field, and an antiferromagnetic The temperature region in which the antiferromagnetism of the capping layer 30 made of a ferromagnetic transition magnetic material changes to ferromagnetic to form a magnetization signal of recording information and at the same time forms a saturation magnetization for generating a recording magnetic field with respect to the magneto-optical recording layer 10. is there.

【００４５】図１１は光磁気記録媒体記録トラックのラ
ンド部５４とグルーブ部５３に情報記録ビット５２を記
録する記録用レーザービームスポットと記録磁界を加え
て記録用レーザービームスポットの移動後の加熱領域６
０と、移動した記録用レーザービーム光スポットの新し
い照射領域６１と、該新しい照射領域６１に至る間の連
続加熱によって温度が最高まで上昇する領域６２とを示
す図１１（ａ）に対応させて、前記光磁気記録媒体記録
トラック上の６０、６２、及び６１の各領域におけるキ
ャッピング層３０、光磁気記録層１０、及び再生用磁性
層２４各々の磁化状態を図１１（ｂ）で表したものであ
る。図１１では反強磁性強磁性遷移磁性材料に常温では
副格子磁化の方向が膜面に対して垂直である材料を用
い、再生用磁性層２４の磁性材料に常温で垂直磁化の材
料を用いた。キャッピング層３０の転移温度が最も低い
ので記録用レーザービーム光スポット新しい照射領域６
１で強磁性に転移し、磁化の向きが３６１で示すように
記録磁界の向きに磁化される。キャッピング層３０の既
に磁化された３６２では光磁気記録層１０の温度が上が
り保磁力が低下したので記録信号が記録されて、さらに
再生用磁性層２４へ記録磁区２２２が転写される。キャ
ッピング層３０の既に磁化された後温度が常温まで低下
した領域３５９では元の副格子磁化の方向が膜面に対し
て垂直な反強磁性に戻っているが、記録層１０及び再生
層２４には記録磁化が保磁される。FIG. 11 shows a recording laser beam spot for recording information recording bits 52 in the land 54 and groove 53 of the recording track of the magneto-optical recording medium, and a heating area after the recording laser beam spot is moved by applying a recording magnetic field. 6
FIG. 11A showing 0, a new irradiation area 61 of the moved recording laser beam light spot, and an area 62 where the temperature rises to the maximum by continuous heating until reaching the new irradiation area 61. FIG. 11B shows the magnetization states of the capping layer 30, the magneto-optical recording layer 10, and the reproducing magnetic layer 24 in the areas 60, 62, and 61 on the recording track of the magneto-optical recording medium. It is. In FIG. 11, a material whose direction of sublattice magnetization is perpendicular to the film surface at room temperature is used as an antiferromagnetic ferromagnetic transition magnetic material, and a material having perpendicular magnetization at room temperature is used as a magnetic material of the reproducing magnetic layer 24. . Since the transition temperature of the capping layer 30 is the lowest, the recording laser beam light spot new irradiation area 6
The transition to ferromagnetic occurs at 1 and the magnetization is magnetized in the direction of the recording magnetic field as indicated by 361. At the already magnetized 362 of the capping layer 30, the temperature of the magneto-optical recording layer 10 rises and the coercive force decreases, so that a recording signal is recorded, and the recording magnetic domain 222 is transferred to the reproducing magnetic layer 24. In the region 359 of the capping layer 30 where the temperature has been lowered to room temperature after being magnetized, the original direction of the sublattice magnetization has returned to antiferromagnetism perpendicular to the film surface. Is coerced in the recording magnetization.

【００４６】反強磁性強磁性遷移磁性材料に常温では副
格子磁化の方向が膜面に対して平行である材料を用い、
再生用磁性層２４の磁性材料に常温では面内磁化である
が臨界温度Ｔcr2以上では垂直磁化に転移する磁性材料
を用い，さらに常温では面内磁化であるが臨界温度Ｔcr
1以上では垂直磁化に転移すると共に臨界温度Ｔcr1がキ
ャッピング層３０の転移温度（Ｔat）及び再生用磁性層
２４の臨界温度Ｔcr2よりも高い磁性材料からなる第１
補助磁性層２５を用いた場合について図１２に示した。
キャッピング層３０の記録用レーザービームスポットの
新しい照射領域６１で強磁性に転移し、記録磁界の向き
３６１に磁化される。キャッピング層３０の既に磁化さ
れた３６２では光磁気記録層１０の温度が上がり保磁力
が低下したので記録信号が記録されて、さらに第１補助
磁性層２５の臨界温度がＴcr1以上になったので再生用
磁性層２４へ光磁気記録層１０の記録磁区が転写磁区２
３１のように転写拡大される。キャッピング層３０の既
に磁化された後温度が常温まで低下した領域３５９では
副格子磁化の方向が膜面に対して垂直な元の状態の反強
磁性に戻り、さらに第１補助磁性層２５及び再生用磁性
層２４も面内磁化の元の状態に戻るが、記録層１０では
記録磁化が保磁される。A material whose sublattice magnetization direction is parallel to the film surface at room temperature is used for the antiferromagnetic ferromagnetic transition magnetic material.
As the magnetic material of the reproducing magnetic layer 24, a magnetic material which has in-plane magnetization at room temperature but changes to perpendicular magnetization at a temperature equal to or higher than the critical temperature Tcr2 is used.
If it is 1 or more, the transition to perpendicular magnetization occurs, and the first critical temperature Tcr1 is higher than the transition temperature (Tat) of the capping layer 30 and the critical temperature Tcr2 of the reproducing magnetic layer 24.
FIG. 12 shows the case where the auxiliary magnetic layer 25 is used.
At the new irradiation region 61 of the recording laser beam spot on the capping layer 30, the ferromagnetic transition occurs, and the magnetization is magnetized in the direction 361 of the recording magnetic field. At the already magnetized 362 of the capping layer 30, a recording signal is recorded because the temperature of the magneto-optical recording layer 10 rises and the coercive force decreases, and reproduction is performed because the critical temperature of the first auxiliary magnetic layer 25 becomes higher than Tcr1. The recording magnetic domain of the magneto-optical recording layer 10 is transferred to the magnetic domain 24 for transfer.
31 is transferred and expanded. In the region 359 of the capping layer 30 where the temperature has been lowered to room temperature after being magnetized, the direction of the sublattice magnetization returns to the original state of antiferromagnetism perpendicular to the film surface. The magnetic layer for use 24 also returns to the original state of the in-plane magnetization, but the recording layer 10 maintains the recording magnetization.

【００４７】次に、本発明の再生原理を説明する。本発
明の光磁気記録媒体に用いる垂直磁化の光磁気記録膜及
び再生用磁性膜は磁性膜の温度が上昇するに伴って保磁
力Ｈｔが低下してキュリ−温度Ｔｃ以上で保磁力が零に
なる性質を有する。反強磁性強磁性遷移材料からなる補
助磁性膜は積層される隣接の磁性層と交換結合して、隣
接の磁性層の磁化向きを強力に固定する。反強磁性から
強磁性に転移する転移温度Ｔatを越えると、反強磁性強
磁性遷移材料からなる補助磁性膜は強磁性化して、隣接
の磁性層との新たな交換結合を生ずる。Next, the reproduction principle of the present invention will be described. In the perpendicularly magnetized magneto-optical recording film and reproducing magnetic film used in the magneto-optical recording medium of the present invention, the coercive force Ht decreases as the temperature of the magnetic film increases, and the coercive force becomes zero above the Curie temperature Tc. Has the following properties: The auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition material exchange-couples with the adjacent magnetic layer to be stacked, and strongly fixes the magnetization direction of the adjacent magnetic layer. When the temperature exceeds the transition temperature Tat at which transition from antiferromagnetic to ferromagnetic occurs, the auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition material becomes ferromagnetic, and new exchange coupling occurs with an adjacent magnetic layer.

【００４８】本発明の光磁気記録媒体では、光磁気記録
層に記録された記録磁区を再生する手段として、光磁気
記録媒体に積層形成される再生用磁性膜及び／或いは反
強磁性強磁性遷移材料からなる補助磁性膜に記録磁区を
転写させ、拡大させて、この拡大された再生用磁性膜及
び／或いは反強磁性強磁性遷移材料からなる補助磁性膜
の転写記録磁区から得られる再生用レーザ光の偏光カー
回転角を検出することによって読みとり再生する。とこ
ろで、Ｓ／Ｎ比の大きい再生信号を得るためには、光磁
気記録層の記録磁区を光磁気記録層から再生用磁性膜及
び／或いは反強磁性強磁性遷移材料からなる補助磁性膜
へ転写させ、さらに拡大させる段階で、記録磁区信号磁
界に記録磁区信号以外の外部磁化、洩れ磁界等のノイズ
を限りなく零に低減しなければならない。ノイズを低減
し明瞭に転写拡大された記録磁区を得るために、光磁気
記録層からの限りなく純粋な記録磁区信号磁界に限定す
るために、他のノイズ磁界をシャットアウトする、効率
のよいノイズ遮蔽、或いはノイズ遮断を行う手段とし
て、本発明の反強磁性強磁性遷移材料からなる補助磁性
膜を光磁気記録層の積層膜に用いることは極めて有効で
ある。In the magneto-optical recording medium of the present invention, as a means for reproducing the recording magnetic domain recorded in the magneto-optical recording layer, a reproducing magnetic film and / or an antiferromagnetic ferromagnetic transition formed by lamination on the magneto-optical recording medium. The recording magnetic domain is transferred to an auxiliary magnetic film made of a material, and enlarged, and the reproducing laser obtained from the transferred recording magnetic domain of the expanded reproducing magnetic film and / or the auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition material. Reading and reproduction are performed by detecting the polarization Kerr rotation angle of light. Incidentally, in order to obtain a reproduced signal having a large S / N ratio, the recording magnetic domain of the magneto-optical recording layer is transferred from the magneto-optical recording layer to a reproducing magnetic film and / or an auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition material. At the stage of further expansion, noise in the recording magnetic domain signal magnetic field such as external magnetization other than the recording magnetic domain signal and a leakage magnetic field must be reduced to zero as much as possible. Efficient noise that shuts out other noise magnetic fields to limit noise to infinitely pure recording magnetic domain signal magnetic fields from the magneto-optical recording layer in order to reduce noise and obtain clear transferred magnetic domains It is extremely effective to use the auxiliary magnetic film made of the antiferromagnetic ferromagnetic transition material of the present invention as a laminated film of the magneto-optical recording layer as a means for shielding or blocking noise.

【００４９】本発明の再生用磁性層に用いる反強磁性強
磁性遷移材料からなる補助磁性膜は、常温で副格子磁化
の方向が膜面に対して平行或いは垂直な反強磁性であ
り，再生光の照射によって転移温度Ｔatを越えると膜面
に垂直な強磁性磁化へ転移する。面内磁化の反強磁性強
磁性遷移材料からなる補助磁性膜は隣接する磁性膜の面
内磁化と交換結合して、磁化向きをそのままに強力に固
定する。また副格子磁化の方向が膜面に対して垂直であ
る反強磁性強磁性遷移材料では補助磁性膜に隣接する垂
直磁化の磁性膜の磁化の向きを状態のままに強力に固定
する。上記磁性膜に転写される記録磁界信号ができるだ
け純粋なものにするためには、磁性膜の保磁力に近い転
写磁界強度で、磁性膜の保磁力が高い温度で、且つ限ら
れた温度範囲の微小時間に転写を済ませる必要があり、
転写後は外部磁界の影響なく拡大させる必要がある。The auxiliary magnetic film made of the antiferromagnetic ferromagnetic transition material used for the reproducing magnetic layer of the present invention is an antiferromagnetic material whose sublattice magnetization is parallel or perpendicular to the film surface at room temperature. When the transition temperature Tat is exceeded by light irradiation, the transition to ferromagnetic magnetization perpendicular to the film surface occurs. The auxiliary magnetic film made of an in-plane magnetization antiferromagnetic ferromagnetic transition material exchange-couples with the in-plane magnetization of the adjacent magnetic film, and strongly fixes the magnetization direction as it is. In the case of an antiferromagnetic ferromagnetic transition material in which the direction of the sublattice magnetization is perpendicular to the film surface, the direction of the magnetization of the perpendicular magnetic film adjacent to the auxiliary magnetic film is strongly fixed in the state. In order to make the recording magnetic field signal transferred to the magnetic film as pure as possible, at a transfer magnetic field intensity close to the coercive force of the magnetic film, at a temperature at which the coercive force of the magnetic film is high, and in a limited temperature range. It is necessary to complete the transfer in a very short time,
After transfer, it is necessary to enlarge the image without being affected by an external magnetic field.

【００５０】反強磁性強磁性遷移材料からなる補助磁性
膜が保持する反強磁性から強磁性に或いは強磁性から反
強磁性に転移する転移温度Ｔatは、磁性膜の保磁力の大
きい温度で、且つ限られた温度の範囲の微小時間で転写
を済ませるために効果的なシャッターとして機能する。
即ち、再生用レーザ光によって、磁性膜と反強磁性強磁
性遷移材料からなる記録用補助磁性膜（キャッピング
層）３０との積層間に働く強い交換結合力を一時的に弱
めるか或いは解消して、磁化の向きが記録磁区の転写磁
界の向に追随できるように、反強磁性強磁性遷移材料か
らなる補助磁性膜を機能させる。即ち反強磁性強磁性遷
移材料からなる補助磁性膜によって純粋な記録磁区の磁
界だけを透過させて再生用磁性膜へ加えることができる
ようにすること、及び記録磁区が再生用磁性膜に転写さ
れる瞬間だけ交換結合力を弱めるか或いは反強磁性強磁
性遷移材料の補助磁性膜を強磁性化すること、等が反強
磁性強磁性遷移材料を用いた補助磁性膜の重要な機能で
ある。The transition temperature Tat at which the auxiliary magnetic film made of the antiferromagnetic ferromagnetic transition material makes a transition from antiferromagnetic to ferromagnetic or from ferromagnetic to antiferromagnetic is a temperature at which the coercive force of the magnetic film is large. In addition, it functions as an effective shutter for completing transfer in a very short time within a limited temperature range.
That is, the strong exchange coupling force acting between the lamination of the magnetic film and the recording auxiliary magnetic film (capping layer) 30 made of an antiferromagnetic ferromagnetic transition material is temporarily reduced or eliminated by the reproducing laser beam. The auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition material is operated so that the direction of magnetization can follow the direction of the transfer magnetic field of the recording magnetic domain. That is, the auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition material allows only the magnetic field of the pure recording magnetic domain to pass through and can be applied to the reproducing magnetic film, and the recording magnetic domain is transferred to the reproducing magnetic film. An important function of the auxiliary magnetic film using the antiferromagnetic ferromagnetic transition material is to weaken the exchange coupling force or to make the auxiliary magnetic film of the antiferromagnetic ferromagnetic transition material ferromagnetic at an instant.

【００５１】再生用磁性膜の材料は臨界温度Ｔcr2近傍
の温度で光磁気記録層の記録磁区信号の磁界よりも小さ
い保磁力になる材料を用いることが好ましい。再生用磁
性膜に転写した記録磁区のカ−回転角が再生レーザ光に
よって読みとられ、記録情報が再生される。このように
してＳ／Ｎ比の高い再生信号が得られる。本発明では、
再生用磁性膜及び補助磁性膜は臨界温度Ｔcr2と反強磁
性から強磁性に或いは強磁性から反強磁性に転移する転
移温度Ｔatが、 Ｔcr2＜Ｔat となるように再生用磁性
膜及び補助磁性膜の材料を選定して用いるため、再生用
磁性膜の垂直磁化状態となりうる領域は、再生光が照射
された再生光スポット領域内の温度がＴcr2以上に達し
た領域である。即ち再生用磁性膜の臨界温度Ｔcr2以上
に達した領域内では、面内磁区で存在することができな
いので、この臨界温度Ｔcr2以上に達した領域では転写
された記録磁区の拡大が進行する。The material of the reproducing magnetic film is preferably a material having a coercive force smaller than the magnetic field of the recording magnetic domain signal of the magneto-optical recording layer at a temperature near the critical temperature Tcr2. The car rotation angle of the recording magnetic domain transferred to the reproducing magnetic film is read by the reproducing laser beam, and the recorded information is reproduced. In this way, a reproduced signal having a high S / N ratio can be obtained. In the present invention,
The reproducing magnetic film and the auxiliary magnetic film have a critical temperature Tcr2 and a transition temperature Tat at which transition from antiferromagnetic to ferromagnetic or from ferromagnetic to antiferromagnetic is made to satisfy Tcr2 <Tat. Therefore, the region where the reproducing magnetic film can be in a perpendicular magnetization state is a region where the temperature in the reproducing light spot region irradiated with the reproducing light has reached Tcr2 or more. In other words, in the region where the temperature of the reproducing magnetic film has reached the critical temperature Tcr2 or higher, it cannot exist as in-plane magnetic domains. Therefore, in the region where the temperature has reached the critical temperature Tcr2 or higher, the expansion of the transferred recording magnetic domain proceeds.

【００５２】この光磁気記録媒体に、磁性膜の加熱温度
の最高温度が所望の温度になるように、適当なパワーの
再生光を照射すると、再生用磁性膜中にＴcr2以上とな
り垂直磁化状態となりうる領域が発生する。その温度の
領域が光磁気記録膜に記録されている記録磁区Ｍの径以
上、好ましくは再生光スポット径以上となるような臨界
温度Ｔcr2を保持する磁性材料を選択して再生用磁性膜
に用いるか、或いは再生光のパワーを設定して用いる。When the magneto-optical recording medium is irradiated with reproducing light having an appropriate power so that the maximum heating temperature of the magnetic film becomes a desired temperature, the reproducing magnetic film becomes Tcr2 or more and becomes perpendicularly magnetized. Area occurs. A magnetic material having a critical temperature Tcr2 such that the temperature region is equal to or larger than the diameter of the recording magnetic domain M recorded in the magneto-optical recording film, and preferably equal to or larger than the reproducing light spot diameter, is selected and used for the reproducing magnetic film. Or the power of the reproduction light is set and used.

【００５３】光磁気記録媒体に、再生レーザ光を照射し
て再生用磁性膜中に、Ｔcr2以上となり垂直磁化状態が
発生した時点において再生層補助磁性膜の転写磁区（ド
メイン）は拡大するが、再生光が読み取れる大きさ、例
えば再生光スポットの径よりも大きく拡大する。再生用
磁性膜にはＧｄuＦｅvＣｏw合金について元素比u v wの
最適な値の材料を選択して用いる。The transfer magnetic domain (domain) of the reproducing layer auxiliary magnetic film is enlarged when the perpendicular magnetic state occurs at Tcr2 or more in the reproducing magnetic film by irradiating the reproducing laser beam to the magneto-optical recording medium. The size is larger than the size from which the reproduction light can be read, for example, the diameter of the reproduction light spot. For the magnetic film for reproduction, a material having an optimum value of the element ratio uvw for the GduFevCow alloy is selected and used.

【００５４】光磁気記録膜はＴcr2以上の領域内の温度
分布に対応する磁化の分布を有し、最高到達温度となる
領域及びその近傍でその値が充分大きくなるような磁気
特性を有している。各磁性膜の磁気特性を上記のように
設定したため、光磁気記録膜中の温度が高く且つ磁化が
充分大きい領域の磁区Ｍのみが、磁区Ｍの領域で作用す
る光磁気記録膜と補助磁性膜間の交換結合力、及び光磁
気記録膜或いは補助磁性膜と再生用磁性膜間の大きな静
磁結合力によって、再生用磁性膜中の温度が高く且つ保
磁力が充分小さい領域に転写される。これにより、まず
充分な再生分解能が得られる。The magneto-optical recording film has a magnetization distribution corresponding to the temperature distribution in the region of Tcr2 or more, and has a magnetic property such that the value is sufficiently large in the region where the temperature reaches the maximum and in the vicinity thereof. I have. Since the magnetic characteristics of each magnetic film are set as described above, only the magnetic domain M in the region where the temperature is high and the magnetization is sufficiently large in the magneto-optical recording film is the magneto-optical recording film and the auxiliary magnetic film that act in the region of the magnetic domain M. Due to the exchange coupling force between them and the large magnetostatic coupling force between the magneto-optical recording film or the auxiliary magnetic film and the reproducing magnetic film, the image is transferred to a region in the reproducing magnetic film where the temperature is high and the coercive force is sufficiently small. Thereby, a sufficient reproduction resolution can be obtained first.

【００５５】次いで、再生用磁性膜に転写された磁区
は、Ｔcr2以上の領域内の垂直磁気異方性と転写された
磁区からの交換結合力により、図12に示したように拡大
すると考えられる。再生後、即ち再生レーザー光が移動
した後、読み出し部はＴcr2以下に冷却され、再生用磁
性膜は面内磁化膜となり元の状態に戻る。Next, it is considered that the magnetic domain transferred to the reproducing magnetic film expands as shown in FIG. 12 due to the perpendicular magnetic anisotropy in the region above Tcr2 and the exchange coupling force from the transferred magnetic domain. . After the reproduction, that is, after the reproduction laser beam moves, the reading section is cooled to Tcr2 or less, and the reproducing magnetic film becomes an in-plane magnetic film and returns to the original state.

【００５６】再生用磁性膜の磁区拡大の効果は、再生用
磁性膜中の転写磁区が再生光スポット径以上に拡大され
たときに最大になる。この状態では、光磁気記録膜中に
記録された磁区の大きさや形状に関係しない、再生用磁
性膜の性能指数と再生ビーム光のみによって決まる極め
て大きい再生出力が得られる。以上のような再生動作時
の温度においても、光磁気記録膜の保磁力は充分大きい
ために、磁化として記録された情報は完全に保持されて
いる。The effect of enlarging the magnetic domain of the reproducing magnetic film is maximized when the transfer magnetic domain in the reproducing magnetic film is enlarged beyond the reproducing light spot diameter. In this state, an extremely large reproduction output determined only by the performance index of the reproduction magnetic film and the reproduction beam light, regardless of the size and shape of the magnetic domain recorded in the magneto-optical recording film, can be obtained. Since the coercive force of the magneto-optical recording film is sufficiently large even at the above-mentioned temperature during the reproducing operation, the information recorded as the magnetization is completely retained.

【００５７】補助磁性膜に転写された磁区は再生用磁性
膜に転写される。本発明では、補助磁性膜及び再生用磁
性膜はそれぞれの臨界温度がＴcr1 ＞Ｔcr2 となるよう
に設定されているため、図２の媒体内の温度プロファイ
ルに示すように、再生用磁性膜中の垂直磁化状態となり
うる領域は、補助磁性膜２８中のそれよりも径が大きく
なる。このため、図１２に示すように、再生用磁性膜中
の転写磁区２３１は再生用磁性膜中の垂直磁化状態とな
りうる領域内の垂直磁気異方性によって拡大される。The magnetic domains transferred to the auxiliary magnetic film are transferred to the reproducing magnetic film. In the present invention, since the critical temperatures of the auxiliary magnetic film and the reproducing magnetic film are set so that Tcr1> Tcr2, as shown in the temperature profile in the medium of FIG. The region that can be in the perpendicular magnetization state has a larger diameter than that in the auxiliary magnetic film 28. Therefore, as shown in FIG. 12, the transfer magnetic domain 231 in the reproducing magnetic film is enlarged by the perpendicular magnetic anisotropy in a region where the reproducing magnetic film can be in a perpendicular magnetization state.

【００５８】[0058]

【発明の実施の形態】以下、本発明の光磁気記録媒体及
びその再生方法の実施の形態及び実施例を図面を参照し
ながら説明する。本発明の実施例における反強磁性強磁
性遷移材料は記録用磁性層の記録用補助磁性膜としてキ
ャッピング層に限定して用いるものではなく、記録情報
を再生する再生層の再生手段の材料として用いることが
できる。従って同一の媒体の記録用補助磁性層のキャッ
ピング層と再生用磁性層の補助磁性層の２カ所に用いる
こともできる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments and examples of a magneto-optical recording medium and a reproducing method of the present invention will be described below with reference to the drawings. The antiferromagnetic ferromagnetic transition material in the embodiment of the present invention is not limited to the capping layer as a recording auxiliary magnetic film of the recording magnetic layer, but is used as a material of a reproducing means of a reproducing layer for reproducing recorded information. be able to. Therefore, it can be used in two places, that is, the capping layer of the recording auxiliary magnetic layer and the auxiliary magnetic layer of the reproducing magnetic layer on the same medium.

【００５９】また反強磁性強磁性遷移材料を記録用磁性
層の補助磁性膜として記録用磁性膜の両面に形成して用
いることができる。図７、図８、及び図９は一般に用い
られてよく知られている光磁気記録媒体のＴｂＦｅＣｏ
合金からなる光磁気記録再生膜層５１０に反強磁性強磁
性遷移材料からなる記録用補助磁性膜（キャッピング
層）３０及び３００を組み合わせて積層を行って構成し
た光磁気記録媒体であり、情報記録信号の記録際に記録
用レーザビームスポットのパワーを低減する効果が得ら
れる。このために、磁気ヘッド用コイルを光ヘッドに組
み込んで光ヘッドと磁気ヘッドとを一体に構成した光磁
気ヘッド４１４を用いることが可能になり、光磁気デイ
スクの両面記録再生を可能にする効果が得られる。Also, an antiferromagnetic ferromagnetic transition material can be used as an auxiliary magnetic film of the recording magnetic layer formed on both sides of the recording magnetic film. FIGS. 7, 8 and 9 show a commonly used and well-known magneto-optical recording medium, TbFeCo.
This is a magneto-optical recording medium formed by laminating a magneto-optical recording / reproducing film layer 510 made of an alloy with a recording auxiliary magnetic film (capping layer) 30 and 300 made of an antiferromagnetic ferromagnetic transition material. The effect of reducing the power of the recording laser beam spot when recording a signal is obtained. For this reason, it is possible to use the magneto-optical head 414 in which the magnetic head coil is incorporated in the optical head and the optical head and the magnetic head are integrated, and the effect of enabling double-sided recording and reproduction of the magneto-optical disk is obtained. can get.

【００６０】反強磁性強磁性遷移材料の強磁性化に伴う
飽和磁化の温度特性と光磁気記録再生層磁性材料の保磁
力の温度特性との相互関係は、ＦｅＲｈ合金の反強磁性
強磁性遷移材料とＴｂＦｅＣｏ合金の光磁気記録再生層
材料の例で図２６に示すような状態になる。The correlation between the temperature characteristics of the saturation magnetization accompanying the ferromagneticization of the antiferromagnetic ferromagnetic transition material and the temperature characteristics of the coercive force of the magneto-optical recording / reproducing layer magnetic material depends on the antiferromagnetic ferromagnetic transition of the FeRh alloy. FIG. 26 shows an example of the magneto-optical recording / reproducing layer material of the material and the TbFeCo alloy.

【００６１】[0061]

【実施例１】図１３（ａ）の模式図で示す光磁気記録媒
体は一般的な光磁気ヘッドを用いて記録再生が行える記
録媒体で、基板１の上に、第１誘電体膜３、再生用磁性
膜２４、非磁性層２９、光磁気記録膜１０、反強磁性強
磁性遷移材料からなる記録用補助磁性膜（キャッピング
層）３０、第２誘電体膜３１、反射膜８、保護膜７がこ
の順に積層する。第１誘電体膜３、第２誘電体膜３１、
及び非磁性層２９には窒化珪素（Ｓｉ３Ｎ４）、酸化ア
ルミ（Ａｌ２Ｏ３）、窒化アルミ（ＡｌＮ）等の材料か
ら選択して用いる。基板１にはポリカーボネイト樹脂を
用いる。反射膜８にはＡｌ金属、ＡｌＴｉ合金等から選
択して用い、その外側に紫外線硬化性樹脂塗布し、硬化
して保護膜７を積層形成する。基板１の片面にはプリフ
オマッテイング２を形成し、このプリフオマッテイング
２形成面側に誘電体膜３を配置積層する。光磁気記録膜
１０にはＴbＦｅＣｏの合金、或いは必要ならばＴbＦｅ
Ｃｏの合金にＮｂ，Ｃｒ等から選択して添加した合金を
用いる。Embodiment 1 A magneto-optical recording medium shown in the schematic diagram of FIG. 13A is a recording medium on which recording and reproduction can be performed using a general magneto-optical head. Reproducing magnetic film 24, non-magnetic layer 29, magneto-optical recording film 10, auxiliary recording magnetic film (capping layer) 30, made of antiferromagnetic ferromagnetic transition material, second dielectric film 31, reflection film 8, protective film 7 are laminated in this order. A first dielectric film 3, a second dielectric film 31,
For the nonmagnetic layer 29, a material such as silicon nitride (Si3N4), aluminum oxide (Al2O3), or aluminum nitride (AlN) is used. The substrate 1 is made of a polycarbonate resin. The reflective film 8 is selected from an Al metal, an AlTi alloy, or the like, and an ultraviolet curable resin is applied to the outside of the reflective film 8 and cured to form the protective film 7 in a laminated manner. A pre-forming 2 is formed on one side of the substrate 1, and a dielectric film 3 is arranged and laminated on the pre-forming 2 side. The magneto-optical recording film 10 is made of an alloy of TbFeCo or, if necessary, TbFeCo.
An alloy selected from Nb, Cr or the like and added to a Co alloy is used.

【００６２】再生用補助磁性膜２４にはＧｄＦｅＣｏ、
ＧｄＴbＦｅＣｏ等の合金から選択して用いる。反強磁
性強磁性遷移材料からなる記録用補助磁性膜（キャッピ
ング層）３０にはＭｎＯ、Ｃｒ２Ｏ３、ＦｅＳ、ＦｅＣ
ｌ２、ＭｎＡｓ、Ｄｙ、Ｈｏ、Ｅｒ、Ｔｍ合金、Ｄｙ合
金、Ｈｏ合金、Ｅｒ合金、ＦｅＲｈ合金、ＭｎＺｎ合
金、ＳｍＺｎ合金、ＧｄＺｎ合金、ＴｂＺｎ合金、Ｄｙ
Ｚｎ合金、ＨｏＺｎ合金、ＥｒＺｎ合金、ＺｒＦｅ２合
金，ＨｆＦｅ２合金，ＺｒＺｎ２合金，ＦｅＢｅ２合
金，ＳｃＦｅ２合金，ＹＦｅ２合金，ＣｅＦｅ２合金，
ＳｍＦｅ２合金，ＧｄＦｅ２合金、ＤｙＦｅ２合金，Ｈ
ｏＦｅ２合金，ＥｒＦｅ２合金，ＴｍＦｅ２合金，Ｐｒ
Ｃｏ２合金，ＮｄＣｏ２合金，ＳｍＣｏ２合金，ＧｄＣ
ｏ２合金，ＴｂＣｏ２合金，ＤｙＣｏ２合金，ＨｏＣｏ
２合金，ＥｒＣｏ２合金，ＵＦｅ２合金，ＮｐＦｅ２合
金，ＡｇＦｅ２合金、ＡｕＦｅ２合金、ＡｌＦｅ２合
金、ＧａＦｅ２合金、ＩｎＦｅ２合金、ＴｌＦｅ２合金
等の化合物、元素、或いは合金から選択して用いる。反
強磁性強磁性遷移材料からなる記録用補助磁性膜（キャ
ッピング層）３０は常温で反強磁性状態では結晶の隣り
合った磁性原子の磁気モーメントが負の交換相互作用を
もつために磁性が反平行に並んで打ち消し合う。反強磁
性強磁性遷移材料からなる記録用補助磁性膜（キャッピ
ング層）３０の温度が上昇すると磁化率が上昇するが、
反強磁性から強磁性に転移する転移温度Ｔat以上では強
磁性となる。GdFeCo,
An alloy such as GdTbFeCo is selected and used. The recording auxiliary magnetic film (capping layer) 30 made of an antiferromagnetic ferromagnetic transition material has MnO, Cr2O3, FeS, FeC
12, MnAs, Dy, Ho, Er, Tm alloy, Dy alloy, Ho alloy, Er alloy, FeRh alloy, MnZn alloy, SmZn alloy, GdZn alloy, TbZn alloy, Dy
Zn alloy, HoZn alloy, ErZn alloy, ZrFe2 alloy, HfFe2 alloy, ZrZn2 alloy, FeBe2 alloy, ScFe2 alloy, YFe2 alloy, CeFe2 alloy,
SmFe2 alloy, GdFe2 alloy, DyFe2 alloy, H
oFe2 alloy, ErFe2 alloy, TmFe2 alloy, Pr
Co2 alloy, NdCo2 alloy, SmCo2 alloy, GdC
o2 alloy, TbCo2 alloy, DyCo2 alloy, HoCo
2 alloy, ErCo2 alloy, UFe2 alloy, NpFe2 alloy, AgFe2 alloy, AuFe2 alloy, AlFe2 alloy, GaFe2 alloy, InFe2 alloy, TlFe2 alloy, and other compounds, elements, or alloys. The recording auxiliary magnetic film (capping layer) 30 made of an antiferromagnetic ferromagnetic transition material has an antimagnetism at room temperature in an antiferromagnetic state because the magnetic moment of adjacent magnetic atoms of the crystal has a negative exchange interaction. They cancel each other out in parallel. When the temperature of the recording auxiliary magnetic film (capping layer) 30 made of an antiferromagnetic ferromagnetic transition material increases, the magnetic susceptibility increases.
It becomes ferromagnetic at a transition temperature Tat or higher at which transition from antiferromagnetic to ferromagnetic occurs.

【００６３】本発明の光磁気記録媒体は規格化されてい
る全てに適用可能であるが、特に外径が１２０ｍｍ以下
の大きさのもので、記録媒体の厚みが０．６ｍｍ，０．
４ｍｍ，０．８ｍｍ等１．０ｍｍよりも薄いもので１Ｇ
Ｂ（ギガバイト）／平方インチ（スケアインチ）以上の
高密度記録を行うものに好適である。The magneto-optical recording medium of the present invention can be applied to all standardized media. In particular, the magneto-optical recording medium has an outer diameter of 120 mm or less, and the recording medium has a thickness of 0.6 mm.
1G thinner than 1.0mm such as 4mm, 0.8mm
It is suitable for high-density recording of B (gigabyte) / square inch (scare inch) or more.

【００６４】図１３（ａ）に記載する本発明の光磁気記
録媒体の積層体構造は、通常の対物レンズ３０１を保持
する光ヘッドを用いた記録再生装置よって記録再生を行
う方式で、リターゼーション等の小さい光学的特性に優
れた透明な基板１１から再生レーザ光を入射するように
構成されている。しかし、対物レンズ３０１とＳＩＬ
（別名：個体浸漬レンズ、個体イマージョンレンズ、ソ
リッドイマージョンレンズ等）３０２とを併用する光ヘ
ッドが用いられる記録再生装置に対しては図１３（ｂ）
の積層膜構造の光磁気デイスクを用いなければならな
い。図１３（ｂ）の光磁気デイスクでは第１誘電体膜３
を大気に露出させるか、または第１誘電体膜３の外側に
高硬度の透明薄膜の保護膜を形成して、記録用レーザ光
のＳＩＬからのフオカシング距離１００〜５００ｎｍ以
内に、透明な誘電体膜３或いは透明な保護膜と誘電体膜
３との積層膜と再生用磁性膜２４とを形成して用いなけ
ればならない。プリフオマッテイング２を行った基板１
は光磁気記録膜１０の反強磁性強磁性遷移材料からなる
記録用補助磁性膜（キャッピング層）３０側に形成し、
保護膜として用いる。The laminated structure of the magneto-optical recording medium of the present invention shown in FIG. 13 (a) is a method of performing recording and reproduction by a recording and reproducing apparatus using an ordinary optical head holding an objective lens 301. The reproducing laser light is incident from a transparent substrate 11 having excellent small optical characteristics such as the above. However, the objective lens 301 and the SIL
FIG. 13B shows a recording / reproducing apparatus using an optical head that is used in combination with a solid immersion lens (solid immersion lens, solid immersion lens, solid immersion lens, etc.) 302.
A magneto-optical disc having a laminated film structure must be used. In the magneto-optical disk shown in FIG.
Is exposed to the atmosphere, or a protective film of a transparent thin film having high hardness is formed outside the first dielectric film 3 so that the transparent dielectric material is within a focusing distance of 100 to 500 nm of the recording laser light from the SIL. The film 3 or a laminated film of the transparent protective film and the dielectric film 3 and the reproducing magnetic film 24 must be formed and used. Substrate 1 with pre-formatting 2
Is formed on the recording auxiliary magnetic film (capping layer) 30 made of an antiferromagnetic ferromagnetic transition material of the magneto-optical recording film 10,
Used as a protective film.

【００６５】図１４は各磁性膜層の温度特性図であり、
曲線Ａは光磁気記録膜１０の磁界の温度曲線であり、曲
線Ｂは再生用磁性膜２４の臨界温度Ｔcr2以上の飽和磁
化特性であり、曲線Ｃは反強磁性強磁性遷移材料からな
る記録用記録用補助磁性膜（キャッピング層）３０の温
度Ｔat以上の強磁性転移に伴う飽和磁化特性である。光
磁気記録膜１０の保磁力の温度変化は曲線Ｅで示す。記
録用レーザービームの照射による加熱温度で光磁気記録
膜１０の保磁力が低下するのに対して、キャッピング層
の反強磁性強磁性遷移材料からなる記録用記録用補助磁
性膜（キャッピング層）３０は転移温度Ｔat以上で磁気
ヘッドからの記録磁界の向きに磁化し、急激に大きな飽
和磁化に変化して磁界を発生し、温度Ｔ2の位置Ｇ2以上
で光磁気記録膜１０には交換結合によって記録信号が記
録される。この記録温度Ｔ2は従来の記録温度Ｔ1のＧ1
位置より低い温度であり、記録用レーザビームのパワー
を従来より小さくできる効果が得られる。FIG. 14 is a temperature characteristic diagram of each magnetic film layer.
A curve A is a temperature curve of the magnetic field of the magneto-optical recording film 10, a curve B is a saturation magnetization characteristic of the reproducing magnetic film 24 at a critical temperature Tcr2 or more, and a curve C is a recording magnetic film made of an antiferromagnetic ferromagnetic transition material. This is a saturation magnetization characteristic accompanying a ferromagnetic transition of the recording auxiliary magnetic film (capping layer) 30 at a temperature Tat or higher. The temperature change of the coercive force of the magneto-optical recording film 10 is shown by a curve E. While the coercive force of the magneto-optical recording film 10 decreases at the heating temperature due to the irradiation of the recording laser beam, the recording auxiliary recording magnetic film (capping layer) 30 made of an antiferromagnetic ferromagnetic transition material of the capping layer. Is magnetized in the direction of the recording magnetic field from the magnetic head at the transition temperature Tat or higher, rapidly changes to a large saturation magnetization to generate a magnetic field, and is recorded on the magneto-optical recording film 10 by exchange coupling at the temperature T2 or higher at the position G2. The signal is recorded. This recording temperature T2 is G1 of the conventional recording temperature T1.
The temperature is lower than the position, and the effect that the power of the recording laser beam can be made smaller than that of the related art is obtained.

【００６６】本実施例では光磁気記録膜１０のキュリー
温度Ｔｃ０より高いキュリー温度Ｔcaからなるキャッピ
ング層と、Ｔｃ０より高いキュリー温度Ｔｃ１の再生用
磁性膜２４を用いているので、レーザ光の照射によって
記録磁区を再生用磁性膜２４に転写させる温度はＴｃ０
以下に設定しなければならない。再生用磁性膜２４は臨
界温度Ｔcr2までは面内磁化でありＴcr2以上で垂直磁化
へ転移するので、再生用磁性膜２４に転写された記録磁
区は温度がＴcr2以下になると消滅する。記録磁区の再
生はＴcr2以上の温度まで加熱するレーザ光によって再
生用磁性膜２４から再生することができる。In the present embodiment, since the capping layer having a Curie temperature Tca higher than the Curie temperature Tc0 of the magneto-optical recording film 10 and the reproducing magnetic film 24 having a Curie temperature Tc1 higher than Tc0 are used, the laser beam irradiation The temperature at which the recording magnetic domain is transferred to the reproducing magnetic film 24 is Tc0.
Must be set to: Since the reproducing magnetic film 24 has in-plane magnetization up to the critical temperature Tcr2 and transitions to perpendicular magnetization above Tcr2, the recording magnetic domain transferred to the reproducing magnetic film 24 disappears when the temperature becomes Tcr2 or lower. The recording magnetic domain can be reproduced from the reproducing magnetic film 24 by a laser beam heated to a temperature equal to or higher than Tcr2.

【００６７】図１３（ａ）及び図１３（ｂ）の反強磁性
強磁性遷移材料からなる記録記録用補助磁性膜（キャッ
ピング層）３０に、常温で副格子磁化の方向が膜面に対
して垂直な反強磁性強磁性遷移材料を用いた光磁気デイ
スクについて、記録情報信号を記録する行程は図１５に
示す。図１５（ａ）は光磁気記録膜１０と反強磁性強磁
性遷移材料からなる記録用補助磁性膜（キャッピング
層）３０と再生用磁性膜２４の組み合わせ順ついての模
式図である。再生用磁性膜２４側から記録レーザ光を照
射させると、図１５（ｂ）に示すように、反強磁性強磁
性遷移材料からなる記録記録用補助磁性膜（キャッピン
グ層）３０の転移温度Ｔat以上に達した斜線部分２２０
は膜面に垂直な強磁性へ転移する。その部分２２０に隣
接する光磁気記録膜１０には交換結合磁化による記録磁
区或いは記録ビット２２が記録される。再生用磁性膜２
４には転写記録磁区が形成され、ついで転写記録磁区の
磁壁部分では交換結合の影響を受けてＴcr2以上の領域
で図１５（ｂ）の２３１で示すように転写記録磁区が拡
大する。常温の状態では光磁気記録膜１０と反強磁性強
磁性遷移材料からなる記録記録用補助磁性膜（キャッピ
ング層）３０との間で交換結合されて図１５（ｃ）の状
態になる。図１５の臨界温度Ｔcr2と反強磁性から強磁
性へ転移する温度ＴatはＴcr2＜Ｔatの関係にある。The auxiliary magnetic film (capping layer) 30 for recording and recording made of the antiferromagnetic ferromagnetic transition material shown in FIGS. FIG. 15 shows a process of recording a recording information signal on a magneto-optical disk using a perpendicular antiferromagnetic ferromagnetic transition material. FIG. 15A is a schematic diagram showing the combination order of the magneto-optical recording film 10, the recording auxiliary magnetic film (capping layer) 30 made of an antiferromagnetic ferromagnetic transition material, and the reproducing magnetic film 24. When the recording laser beam is irradiated from the reproducing magnetic film 24 side, as shown in FIG. 15B, the transition temperature Tat or more of the recording / recording auxiliary magnetic film (capping layer) 30 made of an antiferromagnetic ferromagnetic transition material is obtained. The shaded area 220 that has reached
Changes to ferromagnetism perpendicular to the film surface. In the magneto-optical recording film 10 adjacent to the portion 220, recording magnetic domains or recording bits 22 are recorded by exchange coupling magnetization. Reproduction magnetic film 2
In FIG. 4, a transfer recording magnetic domain is formed, and then the transfer recording magnetic domain expands in the domain wall portion of the transfer recording magnetic domain in a region above Tcr2 as shown by 231 in FIG. At room temperature, the magneto-optical recording film 10 is exchange-coupled with the recording / recording auxiliary magnetic film (capping layer) 30 made of an anti-ferromagnetic ferromagnetic transition material to be in a state shown in FIG. The critical temperature Tcr2 in FIG. 15 and the temperature Tat at which transition from antiferromagnetic to ferromagnetic is in a relationship of Tcr2 <Tat.

【００６８】[0068]

【実施例２】記録用記録用補助磁性膜（キャッピング
層）３０に常温で副格子磁化の方向が膜面に対して平行
な反強磁性強磁性遷移材料を用いる。この光磁気デイス
クの記録について図１６に模式図で示す。図１６（ａ）
は光磁気記録膜１０と常温で副格子磁化の方向が膜面に
対して平行な反強磁性強磁性遷移材料からなる記録記録
用補助磁性膜（キャッピング層）３０と非磁性膜２５と
常温で垂直磁化の再生用磁性膜２４等の膜構成ついての
模式図である。再生用磁性膜２４側から記録用レーザ光
を照射されると、図１６（ｂ）に示すように、反強磁性
強磁性遷移材料からなる記録記録用補助磁性膜（キャッ
ピング層）３０の転移温度Ｔat以上に達した部分は膜面
に垂直な強磁性に転移すると同時に磁気ヘッド４０の記
録磁界を受けて磁化２２０を生成し、記録温度Ｔ1以上
では光磁気記録層１０に交換結合によって記録磁区２２
が記録される。光磁気記録層１０の記録磁区２２の発生
時に光磁気記録層１０より保磁力の小さい垂直磁化の再
生用磁性膜２４に転写磁区２２２が生成する。その他は
実施例１と同じである。Embodiment 2 An antiferromagnetic ferromagnetic transition material whose sublattice magnetization direction is parallel to the film surface at room temperature is used for a recording auxiliary magnetic film (capping layer) 30 for recording. FIG. 16 is a schematic diagram showing the recording of this magneto-optical disk. FIG. 16 (a)
The auxiliary magnetic film (capping layer) 30 for recording and recording made of an antiferromagnetic ferromagnetic transition material whose sublattice magnetization direction is parallel to the film surface at room temperature with the magneto-optical recording film 10 and the non-magnetic film 25 at room temperature FIG. 3 is a schematic diagram showing a film configuration of a perpendicular magnetization reproducing magnetic film 24 and the like. When the recording laser beam is irradiated from the reproduction magnetic film 24 side, as shown in FIG. 16B, the transition temperature of the recording / recording auxiliary magnetic film (capping layer) 30 made of an antiferromagnetic ferromagnetic transition material is changed. The portion which has reached Tat or higher transitions to ferromagnetism perpendicular to the film surface and, at the same time, receives the recording magnetic field of the magnetic head 40 to generate a magnetization 220.
Is recorded. When the recording magnetic domain 22 of the magneto-optical recording layer 10 is generated, the transfer magnetic domain 222 is generated in the reproducing magnetic film 24 of the perpendicular magnetization having a smaller coercive force than the magneto-optical recording layer 10. Others are the same as the first embodiment.

【００６９】[0069]

【実施例３】本発明の実施例３で用いる光磁気デイスク
の積層膜構成について図１７に模式図で示す。この積層
膜構成は光磁気記録層１０と再生用記録層２４との間に
常温で面内磁化臨界温度Ｔcr1以上で垂直磁化の第１補
助磁性層２５を形成する。記録用補助磁性膜（キャッピ
ング層）３０には反強磁性強磁性遷移磁性材料を用い
る。光磁気記録層１０の外面には紫外線硬化性樹脂の保
護膜を形成する。その他は図１３（ａ）と同じである。Embodiment 3 FIG. 17 is a schematic diagram showing a laminated film structure of a magneto-optical disk used in Embodiment 3 of the present invention. In this laminated film configuration, a first auxiliary magnetic layer 25 having a perpendicular magnetization at an in-plane critical magnetization temperature Tcr1 or higher at room temperature is formed between the magneto-optical recording layer 10 and the reproducing recording layer 24. For the recording auxiliary magnetic film (capping layer) 30, an antiferromagnetic ferromagnetic transition magnetic material is used. On the outer surface of the magneto-optical recording layer 10, a protective film of an ultraviolet curable resin is formed. Others are the same as FIG.

【００７０】図１７に記載する光磁気記録媒体の積層膜
の中で上記第１補助磁性層２５と光磁気記録層１０との
間に窒化珪素（Ｓｉ３Ｎ４）の非磁性層２９を挿入し、
光磁気記録層１０と記録用補助磁性膜（キャッピング
層）３０との間にＡｌＴｉ合金の反射膜８を形成した図
１８に記載する積層膜構成の光磁気記録媒体では、図１
７或いは図１３の光磁気記録媒体よりも記録用レーザビ
ームの照射と記録磁界によって記録される記録感度が高
くなり、よい記録特性が得られ、且つ再生用レーザビー
ムによる再生用記録層２４への記録磁区の転写感度がよ
く、転写記録磁区の再生信号特性はＳ／Ｎ比が大きくな
る。A nonmagnetic layer 29 of silicon nitride (Si3N4) is inserted between the first auxiliary magnetic layer 25 and the magneto-optical recording layer 10 in the laminated film of the magneto-optical recording medium shown in FIG.
In the magneto-optical recording medium having the laminated film structure shown in FIG. 18 in which the reflective film 8 of the AlTi alloy is formed between the magneto-optical recording layer 10 and the recording auxiliary magnetic film (capping layer) 30, FIG.
7 or the recording sensitivity of recording by the recording magnetic field is higher than that of the magneto-optical recording medium of FIG. 13, good recording characteristics are obtained, and the reproducing laser beam is applied to the reproducing recording layer 24. The transfer sensitivity of the recording magnetic domain is good, and the reproduction signal characteristic of the transfer recording magnetic domain has a large S / N ratio.

【００７１】図１７及び図１８の記録媒体の各磁性膜の
飽和磁化温度特性と光磁気記録層１０のＥ保持力及びＡ
磁界の温度変化について図１９に記載する。記録用補助
磁性膜（キャッピング層）３０はＣ反強磁性強磁性遷移
磁性層飽和磁化曲線のようであり、再生用記録層２４の
飽和磁化はＢ曲線のようであり、第１補助磁性層２５の
飽和磁化はＤ曲線のようである。光磁気記録層１０の記
録は温度Ｔ2のＧ２以上で行われる。従って従来の記録
温度Ｔ1のＧ1位置に比較すると記録温度が低減されるか
ら記録用レーザビームのパワーを小さくできる効果が得
られる。転移温度の関係はＴat＜Ｔcr2＜Ｔcr1の関係に
ある。その他は実施例１と同じである。The saturation magnetization temperature characteristics of each magnetic film of the recording medium of FIG. 17 and FIG.
FIG. 19 shows the temperature change of the magnetic field. The recording auxiliary magnetic film (capping layer) 30 looks like a C antiferromagnetic ferromagnetic transition magnetic layer saturation magnetization curve, the saturation magnetization of the reproducing recording layer 24 looks like a B curve, and the first auxiliary magnetic layer 25 Is like the D curve. Recording on the magneto-optical recording layer 10 is performed at G2 or more at the temperature T2. Therefore, the recording temperature is reduced as compared with the G1 position of the conventional recording temperature T1, so that the effect of reducing the power of the recording laser beam can be obtained. The transition temperature has a relationship of Tat <Tcr2 <Tcr1. Others are the same as the first embodiment.

【００７２】[0072]

【実施例４】図２０に光磁気記録層１０のキャッピング
層に常温で副格子磁化の方向が膜面に対して垂直な反強
磁性強磁性遷移磁性材料からなる記録用補助磁性膜３０
用い、さらに常温で副格子磁化の方向が膜面に対して平
行な反強磁性強磁性遷移磁性材料を再生用補助磁性膜３
００に用いる光磁気記録媒体について積層膜構成の模式
図を示す。光磁気記録層１０の片面に反強磁性強磁性遷
移磁性材料からなる記録用補助磁性膜（キャッピング
層）３０を接触して積層し、光磁気記録層１０の反対面
に反強磁性強磁性遷移磁性材料からなる再生用補助磁性
膜３００を接触積層する。キャッピング層３０の外側に
は第２誘電体層３１、反射層８、紫外線硬化樹脂の保護
膜７をこの順に積層し、再生用補助磁性膜３００の再生
レーザ光入射側に第１誘電体層３、基板１を配置形成す
る。基板１の記録層側面にプリフオマッテング２を形成
する。Embodiment 4 FIG. 20 shows a recording auxiliary magnetic film 30 made of an antiferromagnetic ferromagnetic transition magnetic material whose sublattice magnetization is perpendicular to the film surface at room temperature in the capping layer of the magneto-optical recording layer 10.
Further, an auxiliary ferromagnetic ferromagnetic transition magnetic material whose sublattice magnetization direction is parallel to the film surface at room temperature is used as the auxiliary magnetic film 3 for reproduction.
A schematic diagram of a laminated film configuration for the magneto-optical recording medium used in No. 00 is shown. A recording auxiliary magnetic film (capping layer) 30 made of an anti-ferromagnetic ferromagnetic transition magnetic material is laminated on one side of the magneto-optical recording layer 10 in contact with the anti-ferromagnetic ferromagnetic transition. An auxiliary reproducing magnetic film 300 made of a magnetic material is contact-laminated. On the outside of the capping layer 30, a second dielectric layer 31, a reflective layer 8, and a protective film 7 made of an ultraviolet curable resin are laminated in this order, and the first dielectric layer 3 is placed on the reproducing laser beam incident side of the reproducing auxiliary magnetic film 300. Then, the substrate 1 is arranged and formed. A preform matching 2 is formed on the side of the recording layer of the substrate 1.

【００７３】図２０（ａ）に記載する本発明の光磁気記
録媒体の積層体構造は、対物レンズ３０１を保持する通
常の光ヘッドを用いた記録再生装置よって記録再生を行
う方式で、リターゼーション等の小さい光学的特性に優
れた透明な基板１１から記録用レーザ光を照射するよう
に構成されている。記録用レーザビームスポットを照射
して加熱温度が発生すると図２０（ｂ）で模式的に示す
が、反強磁性強磁性遷移磁性材料からなる記録用補助磁
性膜（キャッピング層）３０及び反強磁性強磁性遷移磁
性材料からなる再生用補助磁性膜３００の記録用レーザ
ビームスポット加熱部分が転移温度Ｔat1、Ｔat2になる
と強磁性垂直磁化に転移して、記録磁気ヘッド４０から
の記録磁界によって記録磁化２２に磁化される。光磁気
記録層１０には記録用補助磁性膜（キャッピング層）３
０の転移記録磁化の交換結合力が働き、記録磁区２２０
が記録される。一方反強磁性強磁性遷移磁性材料からな
る再生用補助磁性膜３００の強磁性垂直磁化転移部分に
は記録磁化が転写拡大した磁区２３１が生成する。記録
後冷却した磁性層では図２０（ｃ）の模式図のように光
磁気記録層１０の記録磁区以外は元の状態に戻る。The laminated structure of the magneto-optical recording medium of the present invention shown in FIG. 20 (a) uses a method of performing recording and reproduction by a recording and reproducing apparatus using a normal optical head holding an objective lens 301, and performs reactivation. It is configured to irradiate a recording laser beam from a transparent substrate 11 excellent in small optical characteristics such as. When a heating temperature is generated by irradiating the recording laser beam spot, a recording auxiliary magnetic film (capping layer) 30 made of an antiferromagnetic ferromagnetic transition magnetic material and an antiferromagnetic material are schematically shown in FIG. When the recording laser beam spot heated portion of the reproducing auxiliary magnetic film 300 made of a ferromagnetic transition magnetic material reaches the transition temperatures Tat1 and Tat2, it transitions to ferromagnetic perpendicular magnetization. Is magnetized. A recording auxiliary magnetic film (capping layer) 3 is provided on the magneto-optical recording layer 10.
The exchange coupling force of the transition recording magnetization of 0 works, and the recording magnetic domain 220
Is recorded. On the other hand, at the ferromagnetic perpendicular magnetization transition portion of the reproducing auxiliary magnetic film 300 made of an antiferromagnetic ferromagnetic transition magnetic material, a magnetic domain 231 in which recording magnetization is transferred and expanded is generated. The magnetic layer cooled after recording returns to the original state except for the recording magnetic domains of the magneto-optical recording layer 10 as shown in the schematic diagram of FIG.

【００７４】図２０の光磁気デイスクの反強磁性強磁性
遷移磁性材料からなる再生用補助磁性膜３００と光磁気
記録層１０との間に窒化珪素の非磁性層を介在させた媒
体について図２１に記載する。記録及び記録磁化の転写
拡大のメカニズムに変わりはなく、記録特性及び記録磁
化の転写拡大特性も図２０の光磁気記録媒体と同じであ
る結果が得られる。FIG. 21 shows a medium in which a nonmagnetic layer of silicon nitride is interposed between the auxiliary magnetic film 300 for reproduction made of the antiferromagnetic ferromagnetic transition magnetic material of the magneto-optical disk and the magneto-optical recording layer 10. It describes in. There is no change in the mechanism of recording and transfer expansion of recording magnetization, and a result is obtained in which the recording characteristics and the transfer expansion characteristic of recording magnetization are the same as those of the magneto-optical recording medium of FIG.

【００７５】[0075]

【実施例５】図１７の光磁気記録媒体における第１補助
磁性膜２５の磁性材料の換わりに常温では垂直磁化であ
るが臨界温度Ｔcr3以上で面内磁化に転移する再生用第
３補助磁性材料１２５を用い、光磁気記録層１０に接触
するキャッピング層には常温で副格子磁化の方向が膜面
に対して垂直な反強磁性を示す反強磁性強磁性遷移磁性
材料からなる記録用補助磁性膜３０を用いた光磁気記録
媒体の模式図を図２２に示す。Embodiment 5 In the magneto-optical recording medium of FIG. 17, instead of the magnetic material of the first auxiliary magnetic film 25, the third auxiliary magnetic material for reproduction has a perpendicular magnetization at room temperature but changes to an in-plane magnetization at the critical temperature Tcr3 or more. 125, the capping layer in contact with the magneto-optical recording layer 10 has an auxiliary ferromagnetic ferromagnetic transition magnetic material showing antiferromagnetism in which the direction of the sublattice magnetization is perpendicular to the film surface at room temperature. FIG. 22 shows a schematic diagram of a magneto-optical recording medium using the film 30.

【００７６】光磁気記録層１０、常温垂直磁化で面内磁
化転移の臨界温度Ｔcr3を持つ再生用第３補助磁性材料
１２５、常温反強磁性で強磁性転移温度Ｔatを持ち常温
で副格子磁化の方向が膜面に対して垂直な反強磁性強磁
性遷移磁性材料からなる記録用補助磁性膜（キャッピン
グ層）３０、及び常温面内磁化で垂直磁化転移臨界温度
Ｔcr2を持つ再生用磁性膜２４等について磁性膜の保磁
力−温度特性曲線について図２３に示す。各磁性膜のキ
ュリー温度はＴc0＜Ｔc2＜Ｔcaのように材料を設定され
る。この際の磁化転移温度はＴat＜Ｔcr2＜Ｔcr3であ
る。予め再生用第３補助磁性材料の臨界温度Ｔcr3以上
の温度になるようにパワーを制御した記録用レーザビー
ムを照射し、磁気ヘッドから外部記録磁界Ｈexを加え、
記録用補助磁性膜３０の強磁性転移温度Ｔat以上に達し
た部分を記録磁化する。さらにキャッピング層記録用補
助磁性膜３０の記録磁化と光磁気記録層１０の磁化を交
換結合させて記録磁区２２を記録させる。The magneto-optical recording layer 10, a third auxiliary magnetic material 125 for reproduction having a critical temperature Tcr3 of in-plane magnetization transition at normal temperature perpendicular magnetization, and a normal lattice antiferromagnetic material having a ferromagnetic transition temperature Tat and having a sublattice magnetization at room temperature. A recording auxiliary magnetic film (capping layer) 30 made of an antiferromagnetic ferromagnetic transition magnetic material whose direction is perpendicular to the film surface, and a reproducing magnetic film 24 having room temperature in-plane magnetization and a perpendicular magnetization transition critical temperature Tcr2. FIG. 23 shows a coercive force-temperature characteristic curve of the magnetic film. The material is set such that the Curie temperature of each magnetic film is Tc0 <Tc2 <Tca. The magnetization transition temperature at this time is Tat <Tcr2 <Tcr3. A recording laser beam whose power is controlled so as to be equal to or higher than the critical temperature Tcr3 of the third auxiliary magnetic material for reproduction in advance is applied, and an external recording magnetic field Hex is applied from a magnetic head,
The portion of the recording auxiliary magnetic film 30 which has reached the ferromagnetic transition temperature Tat or higher is subjected to recording magnetization. Further, the recording magnetization of the auxiliary magnetic film 30 for recording the capping layer and the magnetization of the magneto-optical recording layer 10 are exchange-coupled to record the recording magnetic domain 22.

【００７７】次に光磁気記録層１０の記録磁区２２は再
生用第３補助磁性材料の臨界温度Ｔcr3以下の温度の部
分で再生用磁性膜２４に転写されるが、第３補助磁性材
料の臨界温度Ｔcr3以上の温度に達した部分では第３補
助磁性膜１２５によって磁界が遮断され、安定した転写
記録磁化が再生される。その他は実施例１と同じであ
る。Next, the recording magnetic domain 22 of the magneto-optical recording layer 10 is transferred to the reproducing magnetic film 24 at a temperature lower than the critical temperature Tcr3 of the reproducing third auxiliary magnetic material. At the portion where the temperature reaches the temperature Tcr3 or higher, the magnetic field is cut off by the third auxiliary magnetic film 125, and stable transfer recording magnetization is reproduced. Others are the same as the first embodiment.

【００７８】[0078]

【実施例６】本発明の実施例６で用いる光磁気デイスク
の積層膜構成について図２４に模式図で示す。この積層
膜構成は光磁気記録層１０と再生用記録層２４との間に
常温で面内磁化臨界温度Ｔcr1以上で垂直磁化の第１補
助磁性層２５を形成する。記録用補助磁性膜（キャッピ
ング層）３０には常温で副格子磁化の方向が膜面に対し
て垂直な反強磁性強磁性遷移磁性材料を用いる。光磁気
記録層１０の外面には紫外線硬化性樹脂の保護膜を形成
する。さらに記録用補助磁性膜（キャッピング層）３０
と光磁気記録層１０との間に非磁性層２９０を介在させ
直接接触させないようにし、第１補助磁性層２５と再生
用記録層２４との間に非磁性層２９を介在させて直接接
触させないようにする膜構成である。従って常温では光
磁気記録層１０と記録用補助磁性膜（キャッピング層）
３０とは静磁結合の状態にある。図２４に記載する積層
膜の非磁性層２９及び非磁性層２９０には窒化珪素（Ｓ
ｉ３Ｎ４）、酸化アルミニウム、酸化硅素、ＡｌＴｉ合
金等から選択して用いる。第１補助磁性層２５と光磁気
記録層１０とは直接接触させて積層する。各磁性層の転
移温度の関係はＴat＜Ｔcr2＜Ｔcr1の関係にある。[Embodiment 6] Fig. 24 is a schematic diagram showing a laminated film structure of a magneto-optical disk used in Embodiment 6 of the present invention. In this laminated film configuration, a first auxiliary magnetic layer 25 having a perpendicular magnetization at an in-plane critical magnetization temperature Tcr1 or higher at room temperature is formed between the magneto-optical recording layer 10 and the reproducing recording layer 24. For the recording auxiliary magnetic film (capping layer) 30, an antiferromagnetic ferromagnetic transition magnetic material whose sublattice magnetization direction is perpendicular to the film surface at room temperature is used. On the outer surface of the magneto-optical recording layer 10, a protective film of an ultraviolet curable resin is formed. Further, a recording auxiliary magnetic film (capping layer) 30
A non-magnetic layer 290 is interposed between the first auxiliary magnetic layer 25 and the magneto-optical recording layer 10 to prevent direct contact, and a non-magnetic layer 29 is interposed between the first auxiliary magnetic layer 25 and the recording layer for reproduction 24 so as not to make direct contact. It is a film configuration to be made. Therefore, at room temperature, the magneto-optical recording layer 10 and the recording auxiliary magnetic film (capping layer)
30 is in a state of magnetostatic coupling. Silicon nitride (S) is used for the non-magnetic layer 29 and the non-magnetic layer 290 of the laminated film shown in FIG.
i3N4), aluminum oxide, silicon oxide, AlTi alloy, or the like. The first auxiliary magnetic layer 25 and the magneto-optical recording layer 10 are stacked in direct contact. The relationship between the transition temperatures of the respective magnetic layers is such that Tat <Tcr2 <Tcr1.

【００７９】記録用補助磁性膜（キャッピング層）３０
の記録用レーザビームスポット照射と、磁気ヘッドから
記録磁界とが及んだ部分２２０が強磁性に転移し記録磁
界の向きに垂直磁化し、記録用補助磁性膜３０の垂直磁
化とで静磁結合が発生した光磁気記録層１０に記録磁化
２２が生成する。次に第１補助磁性層２５の臨界温度Ｔ
cr1に加熱した部分での垂直磁化転移部分は光磁気記録
層１０の記録磁化２２との交換結合力を受けて磁化し、
さらに臨界温度Ｔcr2の低い再生用記録層２４では記録
磁区の転写と転写垂直磁化による交換結合が働いて転写
垂直磁化２３１が拡大する。上記過程は極微小時間に進
行し、図２４（b）で現される状態を経過する。記録動
作が進行して常温になった部分は光磁気記録層１０の記
録磁化２２以外は元の状態に戻る。その他は実施例１及
び図１３（ａ）と同じである。Recording auxiliary magnetic film (capping layer) 30
The recording laser beam spot irradiation and the portion 220 exposed to the recording magnetic field from the magnetic head are changed to ferromagnetic and are perpendicularly magnetized in the direction of the recording magnetic field, and are subjected to magnetostatic coupling with the perpendicular magnetization of the recording auxiliary magnetic film 30. A recording magnetization 22 is generated in the magneto-optical recording layer 10 in which is generated. Next, the critical temperature T of the first auxiliary magnetic layer 25
The perpendicular magnetization transition portion in the portion heated to cr1 is magnetized by the exchange coupling force with the recording magnetization 22 of the magneto-optical recording layer 10,
Further, in the reproducing recording layer 24 having a lower critical temperature Tcr2, the transfer perpendicular magnetization 231 is expanded by the transfer coupling of the recording magnetic domain and the exchange coupling by the transfer perpendicular magnetization. The above process proceeds in a very short time, and passes through the state shown in FIG. The portion where the recording operation proceeds to room temperature returns to the original state except for the recording magnetization 22 of the magneto-optical recording layer 10. Other configurations are the same as those in the first embodiment and FIG.

【００８０】[0080]

【実施例７】図２４（ａ）に示す積層膜構造の光磁気記
録媒体の基板１、１２、及び樹脂材料保護膜７、７１の
外表面に酸化硅素（ＳｉＯ２）の保護膜を形成した２枚
の光磁気記録媒体について、樹脂材料保護膜７、７１の
外表面の酸化硅素（ＳｉＯ２）保護膜同志をエポッキシ
樹脂系接着剤１００で張り合わせて、図２５に示す構成
の両面記録型光磁気デイスクを作製した。光磁気記録媒
体単板は図２４（ａ）と同じである。この光磁気デイス
ク単板は厚みが０．６０ｍｍであるが、張り合わせた両
面記録型光磁気デイスクは１．３０ｍｍの厚さであっ
た。光ヘッドと磁気ヘッドコイル４２４を一体にした光
磁気ヘッド４２４によって光磁気デイスクの両面に別々
に情報を記録することができる。記録した情報について
再生用レーザビームを照射して再生を行った。得られた
再生信号は図２４（ａ）単板で得られた高いＳ／Ｎ比と
ほぼ同じｄＢの再生信号を得ることができた。その他は
実施例６と同じである。EXAMPLE 7 A protective film of silicon oxide (SiO2) was formed on the outer surfaces of substrates 1 and 12 and resin material protective films 7 and 71 of a magneto-optical recording medium having a laminated film structure shown in FIG. For a single magneto-optical recording medium, a silicon oxide (SiO 2) protective film on the outer surface of the resin material protective films 7 and 71 is adhered to each other with an epoxy resin-based adhesive 100 to form a double-sided recording type magneto-optical disk having the configuration shown in FIG. Was prepared. The single magneto-optical recording medium is the same as that shown in FIG. The single magneto-optical disc had a thickness of 0.60 mm, whereas the bonded double-sided recording magneto-optical disc had a thickness of 1.30 mm. Information can be separately recorded on both surfaces of the magneto-optical disk by the magneto-optical head 424 in which the optical head and the magnetic head coil 424 are integrated. The recorded information was reproduced by irradiating a reproducing laser beam. From the obtained reproduction signal, a reproduction signal having almost the same dB as the high S / N ratio obtained in the single plate of FIG. 24A could be obtained. Others are the same as the sixth embodiment.

【００８１】上記実施例１から実施例７までの実施にお
いて用いた材料、製造方法、稼働手段、測定方法、環境
条件、及びその他については以下に記載するように行っ
た。The materials, manufacturing methods, operating means, measuring methods, environmental conditions, and others used in the above Examples 1 to 7 were carried out as described below.

【００８２】本発明の光磁気記録媒体に用いられる、透
明基板１としては、例えばポリカーボネートやアモルフ
ァスポレオレフィンなどの透明樹脂材料を所望の形状に
成形したものや、所望の形状に形成されたガラス板の片
面に所望のプリフォーマットパターン２が転写された透
明樹脂膜を密着したものなど光透過性のある任意の基板
を用いることができる。誘電体膜３は、膜内で再生用光
ビームを多重干渉させ、見かけ上のカー回転角を増加す
るために設けられるものであって、透明基板１よりも屈
折率が大きい、例えばＳｉ３Ｎ４からなる無機誘電体に
て形成することができる。保護膜は、基板と保護膜との
間に積層される膜体を腐食等の化学的な悪影響から保護
するためのものであって、例えば、Ｓｉ３Ｎ４膜よりな
る。光磁気記録膜１０は室温以上の温度で垂直磁気異方
性を示す垂直磁化膜であり、例えば、ＦｅＣｏ、ＤｙＦ
ｅＣｏ、ＤｙＦｅＣｏなどの希土類と遷移金属の非晶質
合金が最も好ましいが、Ｐｔ膜とＣｏ膜の交互積層体や
ガーネット系酸化物磁性体などの他の知られた光磁気記
録材料を用いることもできる。As the transparent substrate 1 used in the magneto-optical recording medium of the present invention, for example, a transparent resin material such as polycarbonate or amorphous polyolefin is formed into a desired shape, or a glass plate formed into a desired shape is used. Any substrate having a light-transmitting property, such as a substrate in which a transparent resin film having a desired preformat pattern 2 transferred thereon is adhered to one side of the substrate, can be used. The dielectric film 3 is provided for causing a reproduction light beam to cause multiple interference in the film and increasing the apparent Kerr rotation angle, and is made of, for example, Si 3 N 4 having a larger refractive index than the transparent substrate 1. It can be formed of an inorganic dielectric. The protective film is for protecting a film body laminated between the substrate and the protective film from a chemical adverse effect such as corrosion, and is made of, for example, a Si3N4 film. The magneto-optical recording film 10 is a perpendicular magnetization film exhibiting perpendicular magnetic anisotropy at a temperature of room temperature or higher. For example, FeCo, DyF
An amorphous alloy of a rare earth and a transition metal such as eCo and DyFeCo is most preferable. However, other known magneto-optical recording materials such as an alternately laminated body of a Pt film and a Co film or a garnet-based oxide magnetic material may be used. it can.

【００８３】補助磁性膜２８及び再生用磁性膜２４は、
室温（Ｒ．Ｔ．）から室温以上のある臨界温度（Ｔcr
2）までは面内磁化膜であり、Ｔcr2以上では垂直磁化膜
に転移する磁気特性を有する。なお、本明細書において
室温とは光磁気記録媒体が通常使用される雰囲気温度を
示し、使用場所に応じて異なり、特に特定の温度に限定
されるものではない。The auxiliary magnetic film 28 and the reproducing magnetic film 24
From room temperature (RT) to a certain critical temperature above room temperature (Tcr)
Up to 2), the film is an in-plane magnetized film, and has a magnetic property of transitioning to a perpendicular magnetized film at Tcr2 or more. In this specification, room temperature refers to an ambient temperature at which a magneto-optical recording medium is usually used, and varies depending on a place of use, and is not particularly limited to a specific temperature.

【００８４】膜面に垂直な方向に外部磁界を印加した場
合のカー効果のヒステリシスループから求めたθKR／θ
KS（θKR：残留カー回転角、θKS：飽和カー回転角）の
温度依存性を調べてみると、補助磁性膜の材料として
は、例えばＧｄＦｅＣｏ、ＧｄＦｅ、ＧｄＦｅＣｏ、Ｇ
ｄＤｙＦｅＣｏなどの希土類と遷移金属の非晶質合金が
最も好ましい。ΘKR / θ obtained from the hysteresis loop of the Kerr effect when an external magnetic field is applied in a direction perpendicular to the film surface
Examining the temperature dependence of KS (θKR: residual Kerr rotation angle, θKS: saturation Kerr rotation angle), the materials of the auxiliary magnetic film are, for example, GdFeCo, GdFe, GdFeCo, G
An amorphous alloy of a rare earth and a transition metal such as dDyFeCo is most preferred.

【００８５】誘電体膜３、再生用磁性膜２４、補助磁性
膜２８、光磁気記録膜１０及び保護膜７は、例えば、マ
グネトロンスパッタ装置による連続スパッタリング等の
ドライプロセスにより形成することができる。The dielectric film 3, the reproducing magnetic film 24, the auxiliary magnetic film 28, the magneto-optical recording film 10, and the protective film 7 can be formed by a dry process such as continuous sputtering using a magnetron sputtering device.

【００８６】光磁気記録媒体、即ち光磁気ディスクの補
助磁性膜２８を示す。サンプルは、プリフォーマットパ
ターンを有するガラス基板上に、ＳｉＮ膜よりなる誘電
体膜と、Ｇｄ25Ｆｅ56Ｃｏ19膜(II)よりなる再生用磁性
膜と、Ｇｄ28Ｆｅ53Ｃｏ19(Ｉ）膜よりなる補助磁性膜
と 、21Ｆｅ66Ｃｏ13膜よりなる光磁気記録膜と、Ｓｉ
Ｎ膜よりなる保護膜とを順次スパッタリング法により被
着形成して作製した。この場合の各補助磁性膜及び光磁
気記録膜の厚さ並びに磁気特性を表１に示す。表中のＴ
c はキュリー温度を表し、Ｔcrは、再生用磁性膜の面内
磁化膜が垂直磁化膜に変化する、或いは垂直磁化膜が面
内磁化膜に変化する臨界温度を表わす。The auxiliary magnetic film 28 of a magneto-optical recording medium, that is, a magneto-optical disk is shown. The sample is composed of a dielectric film made of a SiN film, a reproducing magnetic film made of a Gd25Fe56Co19 film (II), an auxiliary magnetic film made of a Gd28Fe53Co19 (I) film, and a 21Fe66Co13 film on a glass substrate having a preformat pattern. Magneto-optical recording film and Si
A protective film made of an N film was sequentially formed by sputtering to form a protective film. Table 1 shows the thickness and magnetic characteristics of each auxiliary magnetic film and magneto-optical recording film in this case. T in the table
c represents the Curie temperature, and Tcr represents the critical temperature at which the in-plane magnetic film of the reproducing magnetic film changes to a perpendicular magnetic film or the perpendicular magnetic film changes to an in-plane magnetic film.

【００８７】[0087]

【表１】 材料 膜厚 ＴC ＴCR （ｎｍ） （℃） （℃） 光磁気記録膜 ＦｅＣｏ ５０ ２７０ − 補助磁性膜 ＧｄＦｅＣｏ(I) ７０ ＞４００ １５０ 再生用磁性膜 ＧｄＦｅＣｏ(II) ６０ ＞４００ ９０ 上記のように作製したディスクのデータ記録領域に、レ
ーザービームを一定周期のパルス状に照射しながら外部
磁界を記録信号に応じて変調させて記録を行う光磁界変
調方式を用いて、テスト信号を記録した。記録光パルス
のデューティー比は５０％であった。種々の記録マーク
長の記録マークが形成されるようにテスト信号を与え
た。次いで、対物レンズの開口数ＮＡ＝０．５５、レー
ザー波長３４０、６４０、７８０ｎｍ等のピックアップ
を用い、線速度７．５ｍ／ｓｅｃ、再生パワー２．５ｍ
Ｗ、再生時外部印加磁界をゼロとして種々の長さの記録
マークを再生した。再生ＣＮ比（Ｃ：キャリアレベル、
Ｎ：ノイズレベル）を測定した。Table 1 Material Thickness TC TCR (nm) (° C.) (° C.) Magneto-optical recording film FeCo 50 270-Auxiliary magnetic film GdFeCo (I) 70> 400 150 Magnetic film for reproduction GdFeCo (II) 60> 400 90 The test signal is recorded on the data recording area of the disk manufactured by using the optical magnetic field modulation method that records by modulating the external magnetic field according to the recording signal while irradiating the laser beam in the form of a pulse with a constant period. did. The duty ratio of the recording light pulse was 50%. Test signals were applied so that recording marks of various recording mark lengths were formed. Next, using a pickup having a numerical aperture of the objective lens = 0.55, laser wavelengths of 340, 640, 780 nm, etc., a linear velocity of 7.5 m / sec and a reproduction power of 2.5 m
W, recording marks of various lengths were reproduced by setting the externally applied magnetic field to zero during reproduction. Regeneration CN ratio (C: carrier level,
N: noise level) was measured.

【００８８】本実施例に係るサンプルディスク（データ
は実線）では、記録マーク長０．２μｍにおいても、著
しく高い再生Ｃ／Ｎが得られることがわかった。従っ
て、本発明を用いれば、従来の再生限界を超えた極めて
微小な記録マークの再生が可能となり、記録密度を向上
させることができる。In the sample disk according to the present example (data is a solid line), it was found that a remarkably high reproduction C / N was obtained even at a recording mark length of 0.2 μm. Therefore, according to the present invention, extremely small recording marks exceeding the conventional reproduction limit can be reproduced, and the recording density can be improved.

【００８９】記録及び再生用の光源として、波長６８０
ｎｍ、レンズ開口数０．５５の光ヘッドを用いた。光磁
気ディスクへの記録は光パルス強度変調法を用いた。記
録は、線速度が５ｍ／ｓ、記録周期３２０ｎｓ、記録レ
−ザ−パワ−７．５ｍＷ、パルス幅５３．３ｎｓ、記録
磁界５００Ｏｅの条件で行った。０．８μｍの記録磁区
は１と０等のデ−タに対応して０．８μｍ間隔で記録さ
れた。As a light source for recording and reproduction, a wavelength of 680 is used.
An optical head having a nm and a lens numerical aperture of 0.55 was used. For recording on the magneto-optical disk, an optical pulse intensity modulation method was used. Recording was performed at a linear velocity of 5 m / s, a recording period of 320 ns, a recording laser power of 7.5 mW, a pulse width of 53.3 ns, and a recording magnetic field of 500 Oe. 0.8 μm recording magnetic domains were recorded at 0.8 μm intervals corresponding to data such as 1 and 0.

【００９０】この記録磁区を、次の再生条件で再生し
た。線速度を５．０ｍ／ｓとし、再生レーザーパワーは
磁区拡大のための低パワーＰr1として１．５ｍＷ、磁区
縮小（または消滅）のための高パワーＰr2として３．５
ｍＷの二つのパワ−レベルに変調した。再生パワーの変
調周期は１６０ｎｓであり、低パワーＰr1で１５０ｎｓ
照射し、高パワーＰr2で１０ｎｓ照射した。再生磁界は
一定の直流磁界を用い、記録方向へ約８０Ｏｅ印加し
た。この磁界は、対物レンズ・アクチュエータ−からの
漏洩磁界によっても代用が可能である。This recorded magnetic domain was reproduced under the following reproducing conditions. The linear velocity is 5.0 m / s, the reproducing laser power is 1.5 mW as low power Pr1 for magnetic domain expansion, and 3.5 as high power Pr2 for magnetic domain reduction (or disappearance).
Modulated to two power levels of mW. The modulation cycle of the reproduction power is 160 ns, and 150 ns at low power Pr1.
Irradiation was performed at a high power Pr2 for 10 ns. As the reproducing magnetic field, a constant DC magnetic field was used, and about 80 Oe was applied in the recording direction. This magnetic field can be substituted by a leakage magnetic field from the objective lens / actuator.

【００９１】再生波形から、記録磁区が存在している部
分だけで信号が上昇して、記録磁区が存在しないところ
では信号は上昇していないことがわかった。このこと
は、再生光が記録トッラクの記録磁区が存在している部
分を走査しているときだけ、再生層において記録磁区が
転写、拡大していることを意味する。さらに、再生信号
は、磁気超解像モ−ド、すなわち、磁区転写された磁区
が拡大されずに再生された場合の再生信号の約１．５倍
の大きさに増幅されていた。この再生信号の増幅効果は
さらに微細な記録磁区において顕著に効果を現し、０．
４μｍ以下の微小磁区を記録した場合においても飽和振
幅（再生層の全ての磁化が下向きの場合の再生信号と再
生層の全ての磁化が上向きの場合の再生信号との差）に
対して８０％（対飽和振幅比）の再生信号出力を得るこ
とができた。From the reproduced waveform, it was found that the signal increased only in the portion where the recording magnetic domain was present, and was not increased where the recording magnetic domain was not present. This means that the recording magnetic domain is transferred and expanded in the reproducing layer only when the reproducing light scans the portion where the recording magnetic domain of the recording track exists. Further, the reproduced signal has been amplified to a magnetic super-resolution mode, that is, about 1.5 times as large as the reproduced signal when the magnetic domain transferred by the magnetic domain is reproduced without being enlarged. This effect of amplifying the reproduced signal is remarkably effective in a finer recording magnetic domain.
Even when a small magnetic domain of 4 μm or less is recorded, 80% of the saturation amplitude (the difference between the reproduction signal when all the magnetizations of the reproduction layer are downward and the reproduction signal when all the magnetizations of the reproduction layer are upward). (To the saturation amplitude ratio) was obtained.

【００９２】上記実施例の再生条件は、次のように説明
することができる。すなわち、パワー変調した再生光の
低パワーＰr1で磁区転写及び磁区拡大が起こる温度領
域、即ち、Ｔcr2＝１７５℃〜Tc0mp＝２４０℃にまで再
生層が加熱され、高パワーＰr2で磁区消滅が起こる温度
領域（エリアｃ）即ち、Ｔcomp（２４０℃）を超える温
度からTc0＝２７０℃までに加熱されている。また、記
録方向へ印加した直流磁界約８０Ｏｅは、磁気温度曲線
Ａ及びＢを図に記載のような関係に位置させている。す
なわち、この実施例で用いた光磁気ディスクの磁気温度
特性と印加した直流磁界との関係は、以下の要件(3) 及
び(4) を満足している。以下に、この実施例で説明した
再生方法に必要な要件を列挙する。なお、この実施例で
用いた光磁気記録媒体の再生層と記録層自体の磁気特性
は、前述のように以下の(1) 及び(2)の要件を満足して
いる。The reproduction conditions in the above embodiment can be explained as follows. That is, a temperature region in which magnetic domain transfer and magnetic domain expansion occur at low power Pr1 of the power-modulated reproducing light, that is, a temperature at which the reproducing layer is heated to Tcr2 = 175 ° C. to Tc0mp = 240 ° C. and magnetic domain disappears at high power Pr2. It is heated from a temperature exceeding a region (area c), that is, Tcomp (240 ° C.) to Tc0 = 270 ° C. A DC magnetic field of about 80 Oe applied in the recording direction positions the magnetic temperature curves A and B in the relationship as shown in the figure. That is, the relationship between the magnetic temperature characteristics of the magneto-optical disk used in this embodiment and the applied DC magnetic field satisfies the following requirements (3) and (4). Hereinafter, requirements necessary for the reproducing method described in this embodiment will be listed. The magnetic characteristics of the reproducing layer and the recording layer of the magneto-optical recording medium used in this embodiment satisfy the following requirements (1) and (2) as described above.

【００９３】（１）少なくとも室温で膜面方向に磁化さ
れる再生層が、垂直方向へ磁化する臨界温度Ｔcr2とキ
ュリ−温度Tc0の間に補償温度Tc0mpを有すること。(1) The reproducing layer magnetized at least at room temperature in the film surface direction has a compensation temperature Tc0mp between the critical temperature Tcr2 for magnetization in the perpendicular direction and the Curie temperature Tc0.

【００９４】（２）記録層のキュリ−温度Ｔcが再生層
の補償温度Tc0mpと再生層のキュリ−温度Tc0との間の温
度にあること。(2) The Curie temperature Tc of the recording layer is between the compensation temperature Tc0mp of the reproducing layer and the Curie temperature Tc0 of the reproducing layer.

【００９５】この実施例では前記特定の材料を用いて光
磁気ディスクを構成し、ＤＣ磁界＝８０Ｏｅを記録方向
に印加することにより上記要件（１）〜（２）を満足さ
せたが、この要件（１）〜（２）を満足させることがで
きる材料及び積層構造を有する光磁気記録媒体並びに再
生時に印加する外部磁界の大きさであれば、任意のもの
を用いることができる。再生時に印加するＤＣ磁界は記
録方向のみならず、消去方向であってもよい。In this embodiment, the above requirements (1) and (2) were satisfied by forming a magneto-optical disk using the specific material and applying a DC magnetic field of 80 Oe in the recording direction. Any material can be used as long as it can satisfy the conditions (1) and (2) and a magneto-optical recording medium having a laminated structure and an external magnetic field applied during reproduction. The DC magnetic field applied at the time of reproduction may be not only in the recording direction but also in the erasing direction.

【００９６】本発明の再生方法においては、ＤＣ磁界の
下で、再生光パワー強度を変調することによって、
（ａ) 磁区転写、（ｂ）磁区拡大及び（ｃ）転写磁区の
消滅のプロセスを実行している。これらのプロセスが行
われる時間は、記録層、補助磁化層、再生層の磁気特性
のみならず、記録層、補助磁化層、再生層、非磁性層、
誘電体層、保護層、及びその他の積層可能な磁性層また
は非磁性層、基板等の温度上昇速度や各層間の伝熱速度
にも依存する。これらの速度は、それらの層を構成する
材料の熱伝導性、厚み、積層構造等を適宜変更すること
によって調節することができ、それによって所望の再生
アクセス速度に対応させることができる。In the reproducing method of the present invention, by modulating the reproducing light power intensity under a DC magnetic field,
The processes of (a) magnetic domain transfer, (b) magnetic domain enlargement, and (c) disappearance of the transferred magnetic domain are performed. The time during which these processes are performed depends not only on the magnetic properties of the recording layer, the auxiliary magnetic layer, and the reproducing layer, but also on the recording layer, the auxiliary magnetic layer, the reproducing layer, the nonmagnetic layer,
It also depends on the temperature rise rate of the dielectric layer, the protective layer, and other stackable magnetic or non-magnetic layers, the substrate, etc., and the heat transfer rate between the layers. These speeds can be adjusted by appropriately changing the thermal conductivity, the thickness, the laminated structure, and the like of the materials constituting the layers, and thereby can correspond to a desired reproduction access speed.

【００９７】再生層に隣接する誘電体層及び非磁性層は
適度な断熱性を持つことが好ましいが、その断熱性の程
度は、記録再生のアクセス速度、或いは記録媒体におけ
る記録再生の線速度の大きさ、再生層及び記録層の熱伝
導性とを組み合わせた熱特性との関係で適宜調整するこ
とができる。It is preferable that the dielectric layer and the non-magnetic layer adjacent to the reproducing layer have a suitable heat insulating property. The degree of the heat insulating property depends on the access speed of recording / reproducing or the linear speed of recording / reproducing on the recording medium. The size and the thermal characteristics of the reproducing layer and the recording layer and the thermal characteristics in combination can be adjusted as appropriate.

【００９８】上記実施例では光磁気記録媒体の再生層が
誘電体層と非磁性層によって挟まれている構造を示した
が、上記再生層磁性層に接して面内方向の磁気異方性を
有する磁性体を積層してもよい。この磁性体は、そのキ
ュリー温度まで面内方向の磁気異方性が優勢で、そのキ
ュリー温度は再生層のキュリー温度とほぼ等しいことが
望ましい。かかる磁性体を再生層に接して積層すること
により、再生時の転写磁区におけるブロッホラインの発
生を抑制し、その抑制作用により再生時のノイズを低減
することができる。かかる磁性体の材料としては、ＰTc
0合金、例えば、Ｃｏを２５原子％含むＰTc0合金やＧｄ
ＦｅＣｏ合金等を用いることができる。なお、かかる磁
性体は再生層の上側あるいは下側のいずれの側に接して
積層してもよい。In the above embodiment, the structure in which the reproducing layer of the magneto-optical recording medium is sandwiched between the dielectric layer and the non-magnetic layer has been described. May be laminated. The magnetic material has a predominant in-plane magnetic anisotropy up to its Curie temperature, and it is preferable that the Curie temperature is substantially equal to the Curie temperature of the reproducing layer. By laminating such a magnetic material in contact with the reproducing layer, it is possible to suppress the occurrence of Bloch lines in the transfer magnetic domain at the time of reproducing, and to reduce the noise at the time of reproducing by the suppression action. As a material of such a magnetic material, PTc
0 alloy, for example, PTc0 alloy containing 25 atomic% of Co or Gd
An FeCo alloy or the like can be used. The magnetic material may be laminated on the upper side or the lower side of the reproducing layer.

【００９９】パルス光を照射しながら記録信号に応じて
印加磁界の極性を変調する光磁界変調方式や、ＤＣ磁界
を印加しながら記録信号に応じて光強度を変調する光変
調方式を用いてそれぞれ記録を行ったが、通常のＤＣ光
を用いた磁界変調記録方式、光変調記録方式並びに光磁
界変調方式のいずれの方式を用いてもかまわない。A light magnetic field modulation method for modulating the polarity of an applied magnetic field according to a recording signal while irradiating pulse light, and an optical modulation method for modulating light intensity according to a recording signal while applying a DC magnetic field are used. Although the recording was performed, any of a magnetic field modulation recording method using a normal DC light, a light modulation recording method, and a light magnetic field modulation method may be used.

【０１００】また、上記各実施例に用いた光磁気記録媒
体は、各実施例に記載した積層膜構成の光磁気記録媒体
に限定されるものではなく、各図に記載した各光磁気記
録媒体の何れを各実施例に用いてもかまわない。Further, the magneto-optical recording medium used in each of the above-described embodiments is not limited to the magneto-optical recording medium having the laminated film structure described in each of the embodiments, but each of the magneto-optical recording media shown in each of the drawings. May be used in each embodiment.

【０１０１】[0101]

【発明の効果】本発明では、光磁気記録膜に記録用補助
磁性膜（キャッピング膜）を形成する構成の光磁気記録
媒体ついて、記録用補助磁性膜の材料に常温では反強磁
性で転移温度以上で強磁性に転移する反強磁性強磁性遷
移磁性材料を用いることによって、或いは常温では面内
磁化で臨界温度以上で垂直磁性に転移する磁性材料を用
いることによって記録用レーザビームの照射によって記
録用補助磁性膜を垂直磁化に転移させる過程で記録磁化
向きに磁化し、この記録磁化の交換結合力によって光磁
気記録膜に記録磁化を記録することによって、従来の記
録用レーザビームパワーよりも低いパワーで記録する効
果が得られる。光磁気記録膜の記録磁化を再生用磁性膜
に転写し、さらに転写磁化を拡大させて再生する方式を
上記記録方式とに組み合わせて用いることのできる光磁
気記録媒体が得られる。これによって低パワーのレーザ
ビームによって再生が可能な高密度記録のための超微細
な記録磁区を記録することができる。また転写して拡大
する記録磁化のノイズになるような外部磁場、洩れ磁界
等の磁気ノイズの影響を抑制して、Ｓ／Ｎ比の高い、或
いはＣ／Ｎ比が大幅に向上した記録特性と再生信号を得
ることを可能にした。According to the present invention, in a magneto-optical recording medium having a configuration in which a recording auxiliary magnetic film (capping film) is formed on a magneto-optical recording film, the material of the recording auxiliary magnetic film is antiferromagnetic at normal temperature and has a transition temperature. Recording by laser beam irradiation for recording by using an antiferromagnetic ferromagnetic transition magnetic material that transitions to ferromagnetic above, or by using a magnetic material that transitions to perpendicular magnetism above the critical temperature due to in-plane magnetization at room temperature. The auxiliary magnetic film for recording is magnetized in the direction of recording magnetization in the process of transitioning to perpendicular magnetization, and the recording magnetization is recorded on the magneto-optical recording film by the exchange coupling force of this recording magnetization, so that it is lower than the conventional recording laser beam power. The effect of recording with power is obtained. A magneto-optical recording medium can be obtained in which a method of transferring the recording magnetization of the magneto-optical recording film to the reproducing magnetic film and further expanding the transferred magnetization for reproduction can be used in combination with the above-mentioned recording method. As a result, it is possible to record ultra-fine recording magnetic domains for high-density recording that can be reproduced by a low-power laser beam. In addition, by suppressing the influence of magnetic noise such as an external magnetic field and a leakage magnetic field, which become noise of the recording magnetization that is transferred and expanded, the recording characteristics are improved with a high S / N ratio or a significantly improved C / N ratio. It is possible to obtain a playback signal.

【０１０２】さらに、再生光スポット径に比べて極めて
微小なために従来再生できなかった記録マークについて
も独立して再生することができるため、光磁気記録媒体
の記録密度を著しく向上させることができる。また、再
生時に印加する磁界はＤＣ磁界でよく交番磁界を用いる
必要がないため、安価で簡単な構造の再生装置を用いて
再生操作を行うことができる。Furthermore, since recording marks which could not be reproduced conventionally because they are extremely small compared to the reproducing light spot diameter can be reproduced independently, the recording density of the magneto-optical recording medium can be remarkably improved. . Further, the magnetic field applied at the time of reproduction is a DC magnetic field, and it is not necessary to use an alternating magnetic field. Therefore, the reproduction operation can be performed by using a low-cost and simple reproducing apparatus.

【０１０３】この光磁気記録媒体を用いることにより、
再生光スポットより小さな微小磁区を記録信号として記
録した後、かかる微小磁区を他の磁区と区別して且つ増
幅された再生信号で検出することができる。それゆえ、
本発明の光磁気記録媒体は、高密度光磁気記録媒体とし
て極めて有用である。By using this magneto-optical recording medium,
After recording a minute magnetic domain smaller than the reproduction light spot as a recording signal, the minute magnetic domain can be distinguished from other magnetic domains and detected by an amplified reproduction signal. therefore,
The magneto-optical recording medium of the present invention is extremely useful as a high-density magneto-optical recording medium.

【図面の簡単な説明】[Brief description of the drawings]

【図１】図１は、本発明の光磁気記録媒体に用いる記録
再生装置の回路図である。FIG. 1 is a circuit diagram of a recording / reproducing apparatus used for a magneto-optical recording medium of the present invention.

【図２】図２は、本発明の光磁気記録媒体に適用する光
ヘッドと磁気ヘッドの構成についての概念図である。FIG. 2 is a conceptual diagram illustrating a configuration of an optical head and a magnetic head applied to the magneto-optical recording medium of the present invention.

【図３】図３は、本発明の光磁気記録媒体に適用する光
磁気ヘッドの構成についての概念図である。FIG. 3 is a conceptual diagram illustrating a configuration of a magneto-optical head applied to the magneto-optical recording medium of the present invention.

【図４】図４は、本発明の光磁気記録媒体に適用する光
ヘッドと磁気ヘッドの構成についての概念図である。FIG. 4 is a conceptual diagram illustrating the configuration of an optical head and a magnetic head applied to the magneto-optical recording medium of the present invention.

【図５】図５は、本発明の光磁気記録媒体に適用する光
磁気ヘッドの構成についての概念図である。FIG. 5 is a conceptual diagram illustrating a configuration of a magneto-optical head applied to the magneto-optical recording medium of the present invention.

【図６】図６は、本発明の光磁気記録媒体に適用する磁
性膜層の磁性の温度特性を示すグラフである。FIG. 6 is a graph showing temperature characteristics of magnetism of a magnetic film layer applied to the magneto-optical recording medium of the present invention.

【図７】図７は、本発明の光磁気記録媒体の積層膜構成
を示す概念図である。FIG. 7 is a conceptual diagram showing a laminated film configuration of the magneto-optical recording medium of the present invention.

【図８】図８は、本発明の光磁気記録媒体の積層膜構成
を示す概念図である。FIG. 8 is a conceptual diagram showing a laminated film configuration of the magneto-optical recording medium of the present invention.

【図９】図９は、本発明の光磁気記録媒体の積層膜構成
を示す概念図である。FIG. 9 is a conceptual diagram showing a laminated film configuration of the magneto-optical recording medium of the present invention.

【図１０】図１０は、本発明の光磁気記録媒体の積層膜
構成に再生用レーザ光スポットを照射した際の各磁性膜
の温度分布の推定を表した図である。FIG. 10 is a diagram showing an estimation of a temperature distribution of each magnetic film when a laser beam spot for reproduction is irradiated on a laminated film configuration of the magneto-optical recording medium of the present invention.

【図１１】図１１は、本発明の光磁気記録媒体の記録ピ
ットに照射したレーザ光スポットによって発生する熱挙
動と各磁性層の磁化状態との関係を示す概念図である。FIG. 11 is a conceptual diagram showing a relationship between a thermal behavior generated by a laser beam spot irradiated on a recording pit of the magneto-optical recording medium of the present invention and a magnetization state of each magnetic layer.

【図１２】図１２は、本発明の光磁気記録媒体の記録ピ
ットに照射したレーザ光スポットによって発生する熱挙
動と各磁性層の磁化状態との関係を示す概念図である。FIG. 12 is a conceptual diagram showing a relationship between a thermal behavior generated by a laser light spot irradiated on a recording pit of a magneto-optical recording medium of the present invention and a magnetization state of each magnetic layer.

【図１３】図１３は、（ａ）（ｂ）共に本発明の光磁気
記録媒体の積層構造を概念的に示す断面図である。FIGS. 13A and 13B are cross-sectional views conceptually showing the laminated structure of the magneto-optical recording medium of the present invention, both in FIGS.

【図１４】図１４は、本発明の光磁気記録媒体の光磁気
記録層と記録用補助磁性膜と再生用磁性層の磁気温度特
性を示す図である。FIG. 14 is a diagram showing the magnetic temperature characteristics of the magneto-optical recording layer, the recording auxiliary magnetic film, and the reproducing magnetic layer of the magneto-optical recording medium of the present invention.

【図１５】図１５は、本発明の光磁気記録媒体の積層構
造を概念的に示す断面図（ａ）、光磁気記録媒体の各磁
性膜層の磁化状態を示す概念図（ｂ）（ｃ）である。FIG. 15 is a sectional view conceptually showing a laminated structure of the magneto-optical recording medium of the present invention, and conceptual views (b) and (c) showing magnetization states of respective magnetic film layers of the magneto-optical recording medium. ).

【図１６】図１６は、本発明の光磁気記録媒体の積層構
造を概念的に示す断面図（ａ）、光磁気記録媒体の各磁
性膜層の磁化状態を示す概念図（ｂ）（ｃ）である。FIG. 16 is a sectional view conceptually showing a laminated structure of a magneto-optical recording medium of the present invention, and conceptual views (b) and (c) showing magnetization states of respective magnetic film layers of the magneto-optical recording medium. ).

【図１７】図１７は、本発明の光磁気記録媒体の積層膜
構成を概念的に示す断面図である。FIG. 17 is a sectional view conceptually showing a laminated film configuration of the magneto-optical recording medium of the present invention.

【図１８】図１８は、本発明の光磁気記録媒体の積層膜
構成を概念的に示す断面図である。FIG. 18 is a sectional view conceptually showing a laminated film configuration of the magneto-optical recording medium of the present invention.

【図１９】図１９は、本発明の光磁気記録媒体の光磁気
記録層と再生用補助磁化膜と再生用磁性層と記録用補助
磁化膜の磁気温度特性を示す図である。FIG. 19 is a diagram showing the magnetic temperature characteristics of the magneto-optical recording layer, the reproducing auxiliary magnetic film, the reproducing magnetic layer, and the recording auxiliary magnetic film of the magneto-optical recording medium of the present invention.

【図２０】図２０は、本発明の光磁気記録媒体の積層構
造を概念的に示す断面図（ａ）、光磁気記録媒体の各磁
性膜層の磁化状態を示す概念図（ｂ）（ｃ）である。FIG. 20 is a sectional view conceptually showing a laminated structure of the magneto-optical recording medium of the present invention, and conceptual views (b) and (c) showing magnetization states of respective magnetic film layers of the magneto-optical recording medium. ).

【図２１】図２１は、本発明の光磁気記録媒体の積層構
造を概念的に示す断面図（ａ）、光磁気記録媒体の各磁
性膜層の磁化状態を示す概念図（ｂ）（ｃ）である。FIG. 21 is a sectional view conceptually showing a laminated structure of a magneto-optical recording medium of the present invention, and conceptual views (b) and (c) showing magnetization states of respective magnetic film layers of the magneto-optical recording medium. ).

【図２２】図２２は、本発明の光磁気記録媒体の積層構
造を概念的に示す断面図である。FIG. 22 is a sectional view conceptually showing a laminated structure of the magneto-optical recording medium of the present invention.

【図２３】図２３は、本発明の光磁気記録媒体の光磁気
記録層と再生用補助磁化膜と再生用磁性層と記録用補助
磁化膜の磁気温度特性を示す図である。FIG. 23 is a diagram showing the magnetic temperature characteristics of the magneto-optical recording layer, the reproducing auxiliary magnetic film, the reproducing magnetic layer, and the recording auxiliary magnetic film of the magneto-optical recording medium of the present invention.

【図２４】図２４は、本発明の光磁気記録媒体の積層構
造を概念的に示す断面図（ａ）、光磁気記録媒体の各磁
性膜層の磁化状態を示す概念図（ｂ）（ｃ）である。FIG. 24 is a sectional view conceptually showing a laminated structure of the magneto-optical recording medium of the present invention, and conceptual views (b) and (c) showing the magnetization state of each magnetic film layer of the magneto-optical recording medium. ).

【図２５】図２５は、本発明の両面記録型光磁気記録媒
体の積層構造を概念的に示す断面図である。FIG. 25 is a sectional view conceptually showing a laminated structure of a double-sided recording type magneto-optical recording medium of the present invention.

【図２６】図２６は、本発明の光磁気記録媒体の光磁気
記録層の保磁力と反強磁性強磁性遷移磁性材料の磁気温
度特性を示す図である。FIG. 26 is a diagram showing the coercive force of the magneto-optical recording layer of the magneto-optical recording medium of the present invention and the magnetic temperature characteristics of the antiferromagnetic ferromagnetic transition magnetic material.

【符号の説明】[Explanation of symbols]

１、１１、１２ 基板 ３、３１ 誘電体膜 ２４、１２４、２４０ 再生用磁性膜 ４、１０、５１０ 光磁気記録膜 ２５、１２５、３００ 再生用補助磁化膜 ３０、１３０、３０１、３３０ 記録用補助磁化膜 ２９ 非磁性層 1, 11, 12 Substrate 3, 31 Dielectric film 24, 124, 240 Reproducing magnetic film 4, 10, 510 Magneto-optical recording film 25, 125, 300 Reproducing auxiliary magnetic film 30, 130, 301, 330 Recording auxiliary Magnetized film 29 Non-magnetic layer

Claims (17)

【特許請求の範囲】[Claims] 【請求項１】 少なくとも光磁気記録層を有する光磁気
記録媒体において、反強磁性強磁性遷移磁性材料からな
る記録用補助磁性膜を積層構成し、前記光磁気記録媒体
に記録用レーザ光を照射することによって前記記録用補
助磁性膜を転移温度以上に加熱されて反強磁性強磁性遷
移磁性材料を反強磁性から強磁性へ転移し、記録磁界下
で記録磁化し、ついで前記光磁気記録層に記録磁化を生
成させることによって記録されることを特徴とする光磁
気記録媒体。1. A magneto-optical recording medium having at least a magneto-optical recording layer, wherein a recording auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition magnetic material is laminated, and the magneto-optical recording medium is irradiated with a recording laser beam. Then, the recording auxiliary magnetic film is heated to a transition temperature or higher to transition the antiferromagnetic ferromagnetic transition magnetic material from antiferromagnetic to ferromagnetic, and to perform recording magnetization under a recording magnetic field. A magneto-optical recording medium characterized in that recording is performed by generating recording magnetization in the medium. 【請求項２】 少なくとも光磁気記録層を有する光磁気
記録媒体において、常温以上の温度で垂直磁化に転移す
る磁性材料からなる記録用補助磁性膜を積層構成し、前
記光磁気記録媒体に記録用レーザ光を照射することによ
って前記記録用補助磁性膜を転移温度以上に加熱して垂
直磁化に転移し、記録磁界下で記録磁化し、ついで前記
光磁気記録層に記録磁化を生成させることによって記録
されることを特徴とする光磁気記録媒体。2. A magneto-optical recording medium having at least a magneto-optical recording layer, wherein a recording auxiliary magnetic film made of a magnetic material which transitions to perpendicular magnetization at a temperature equal to or higher than room temperature is laminated to form a recording medium on the magneto-optical recording medium. By irradiating a laser beam, the recording auxiliary magnetic film is heated to a transition temperature or higher to be transitioned to perpendicular magnetization, is subjected to recording magnetization under a recording magnetic field, and is then recorded by generating recording magnetization in the magneto-optical recording layer. A magneto-optical recording medium. 【請求項３】 少なくとも光磁気記録膜を有する光磁気
記録媒体において、該光磁気記録膜の両面の少なくとも
片方の面側に反強磁性強磁性遷移磁性材料からなる記録
用補助磁性膜を積層構成し、前記光磁気記録媒体に記録
用レーザ光を照射することによって前記記録用補助磁性
膜が転移温度以上に加熱されて反強磁性強磁性遷移磁性
材料を反強磁性から強磁性へ転移し、記録磁界下で記録
磁化し、ついで前記光磁気記録層に記録磁化を生成させ
ることによって記録されることを特徴とする光磁気記録
媒体。3. A magneto-optical recording medium having at least a magneto-optical recording film, wherein a recording auxiliary magnetic film made of an anti-ferromagnetic ferromagnetic transition magnetic material is laminated on at least one of both surfaces of the magneto-optical recording film. Then, by irradiating the laser beam for recording to the magneto-optical recording medium, the auxiliary recording magnetic film for recording is heated to a transition temperature or higher to transition the antiferromagnetic ferromagnetic transition magnetic material from antiferromagnetic to ferromagnetic, A magneto-optical recording medium characterized in that recording is performed by performing recording magnetization under a recording magnetic field and then generating recording magnetization in the magneto-optical recording layer. 【請求項４】 少なくとも光磁気記録層を有する光磁気
記録媒体において、該光磁気記録膜の両面の少なくとも
片方の面側に常温以上の温度で垂直磁化に転移する磁性
材料からなる記録用補助磁性膜を設け、前記光磁気記録
媒体に記録用レーザ光を照射することによって前記記録
用補助磁性膜を転移温度以上に加熱して垂直磁化に転移
し、記録磁界下で記録磁化し、ついで前記光磁気記録層
に記録磁化を生成させることによって記録されることを
特徴とする光磁気記録媒体。4. In a magneto-optical recording medium having at least a magneto-optical recording layer, at least one of both surfaces of the magneto-optical recording film is made of a magnetic material which transitions to perpendicular magnetization at a temperature of room temperature or higher at an auxiliary temperature. By irradiating a recording laser beam to the magneto-optical recording medium, the recording auxiliary magnetic film is heated to a transition temperature or higher to be transitioned to perpendicular magnetization, and is subjected to recording magnetization under a recording magnetic field. A magneto-optical recording medium recorded by generating recording magnetization in a magnetic recording layer. 【請求項５】 少なくとも光磁気記録層を有する光磁気
記録媒体において、レーザ光の照射によって垂直磁化へ
転移する磁性材料からなる、再生用磁性膜と記録用補助
磁性膜とを備えることを特徴とする光磁気記録媒体。5. A magneto-optical recording medium having at least a magneto-optical recording layer, comprising: a reproducing magnetic film and a recording auxiliary magnetic film made of a magnetic material which changes to perpendicular magnetization upon irradiation with a laser beam. Magneto-optical recording medium. 【請求項６】 少なくとも光磁気記録層を有する光磁気
記録媒体において、前記光磁気記録層の記録用レーザ光
入射側に常温で面内磁化を示すが臨界温度Ｔcr1以上で
垂直磁化へ転移する材料からなる再生用磁性膜と転移温
度以上で垂直磁化し、記録磁界下で記録磁化し、ついで
前記光磁気記録層に記録磁化を生成させるる記録用補助
磁性膜とを備えることを特徴とする光磁気記録媒体。6. In a magneto-optical recording medium having at least a magneto-optical recording layer, a material which exhibits in-plane magnetization at room temperature on the recording laser beam incident side of the magneto-optical recording layer but transitions to perpendicular magnetization at a critical temperature Tcr1 or higher. And a recording auxiliary magnetic film for perpendicularly magnetizing at a transition temperature or higher, performing recording magnetization under a recording magnetic field, and then generating recording magnetization in the magneto-optical recording layer. Magnetic recording medium. 【請求項７】 基板上に少なくとも記録用磁化膜と再生
用磁化膜を備え、記録用レーザ光を照射することによっ
て記録される光磁気記録媒体おいて、前記記録用磁化膜
の近傍に、記録用レーザ光の照射によって加熱されて垂
直磁化に転移する記録用補助磁化膜が形成されることを
特徴とする光磁気記録媒体。7. A magneto-optical recording medium having at least a recording magnetic film and a reproducing magnetic film on a substrate, and recording by irradiating a recording laser beam, wherein recording is performed in the vicinity of the recording magnetic film. A magneto-optical recording medium, wherein a recording auxiliary magnetic film which is heated by irradiation of a laser beam for recording and changes into perpendicular magnetization is formed. 【請求項８】 基板上に少なくとも記録用磁化膜と再生
用磁化膜を備え、記録用レーザ光を記録用磁化膜に照射
することによって記録する光磁気記録媒体おいて、前記
記録用磁化膜の近傍に副格子磁化の方向が常温で膜面に
対して垂直である反強磁性強磁性遷移磁性材料からなる
記録用補助磁化膜を形成することを特徴とする光磁気記
録媒体。8. A magneto-optical recording medium comprising at least a recording magnetic film and a reproducing magnetic film on a substrate, wherein recording is performed by irradiating a recording laser beam to the recording magnetic film. A magneto-optical recording medium comprising a recording auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition magnetic material in which the direction of the sublattice magnetization is perpendicular to the film surface at room temperature. 【請求項９】 基板上に少なくとも記録用磁化膜と再生
用磁化膜を備え、記録用レーザ光を記録用磁性膜に照射
することによって記録する光磁気記録媒体おいて、前記
記録用磁化膜の近傍に副格子磁化の方向が常温で膜面に
対して平行である反強磁性強磁性遷移磁性材料からなる
記録用補助磁化膜を形成することを特徴とする光磁気記
録媒体。9. A magneto-optical recording medium having at least a recording magnetic film and a reproducing magnetic film on a substrate, and recording by irradiating the recording magnetic film with a recording laser beam. A magneto-optical recording medium comprising a recording auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition magnetic material in which the direction of the sublattice magnetization is parallel to the film surface at room temperature. 【請求項１０】 請求項５、６、７、８、及び９におい
て、前記記録用磁化膜と前記記録用補助磁化膜とは直接
接触することを特徴とする光磁気記録媒体。10. The magneto-optical recording medium according to claim 5, wherein the recording magnetic film and the recording auxiliary magnetic film are in direct contact with each other. 【請求項１１】 請求項５、６、７、８、及び９におい
て、前記記録用磁化膜と前記記録用補助磁化膜との間に
非磁性層が介在することを特徴とする光磁気記録媒体。11. The magneto-optical recording medium according to claim 5, wherein a non-magnetic layer is interposed between the recording magnetic film and the recording auxiliary magnetic film. . 【請求項１２】 請求項５、６、７、８、及び９におい
て、前記光磁気記録媒体は、レーザ光の照射によって転
移温度以上に加熱されると垂直磁化に転移する補助磁性
膜が前記再生用磁化膜に接触して形成されることを特徴
とする光磁気記録媒体。12. The reproducing method according to claim 5, wherein the auxiliary magnetic film of the magneto-optical recording medium, which is heated to a transition temperature or higher by irradiation of a laser beam, transitions to perpendicular magnetization. A magneto-optical recording medium formed in contact with a magnetic film for use. 【請求項１３】 請求項５、６、７、８、及び９におい
て、前記光磁気記録媒体には、レーザ光の照射によって
転移温度以上に加熱されると垂直磁化に転移する補助磁
性膜が形成されており、該補助磁性膜は前記再生用磁化
膜との間に非磁性層が介在されることを特徴とする光磁
気記録媒体。13. The magneto-optical recording medium according to claim 5, wherein an auxiliary magnetic film that changes to perpendicular magnetization when heated to a transition temperature or higher by laser light irradiation is formed on the magneto-optical recording medium. A magneto-optical recording medium, wherein a non-magnetic layer is interposed between the auxiliary magnetic film and the reproducing magnetic film. 【請求項１４】 請求項５、６、７、８、及び９におい
て、前記光磁気記録媒体は前記記録用磁化膜と前記再生
用磁化膜との間に、レーザ光の照射によって転移温度以
上に加熱されると垂直磁化に転移する補助磁性膜が形成
されておることを特徴とする光磁気記録媒体。14. The magneto-optical recording medium according to claim 5, wherein the magneto-optical recording medium has a temperature between the recording magnetic film and the reproducing magnetic film which is higher than a transition temperature by laser light irradiation. A magneto-optical recording medium, wherein an auxiliary magnetic film which changes to perpendicular magnetization when heated is formed. 【請求項１５】 請求項１１において、前記非磁性層に
は光磁気記録媒体において光反射膜、断熱性膜、誘電体
膜、透明保護膜、基板材料等の用いられる材料から選択
される材料を用いることを特徴とする光磁気記録媒体。15. The non-magnetic layer according to claim 11, wherein a material selected from materials used in a magneto-optical recording medium, such as a light reflecting film, a heat insulating film, a dielectric film, a transparent protective film, and a substrate material. A magneto-optical recording medium characterized by being used. 【請求項１６】 基板上に少なくとも記録用磁性膜と再
生用磁性膜を備え、記録用レーザ光を該記録用磁性膜に
照射することによって記録する光磁気記録媒体おいて、
記録用補助磁性膜、記録用磁性膜、非磁性材料膜、室温
では面内磁化で臨界温度以上で垂直磁化に転移する第１
の補助磁性膜、非磁性材料膜、反強磁性強磁性遷移磁性
材料からなる補助磁性膜、室温では面内磁化で臨界温度
以上で垂直磁化に転移する再生用磁性膜として機能する
第２の補助磁性膜等の膜層を備えると共に、この順に積
層構成されることを特徴とする光磁気記録媒体。16. A magneto-optical recording medium comprising at least a recording magnetic film and a reproducing magnetic film on a substrate, wherein recording is performed by irradiating the recording magnetic film with a recording laser beam.
Auxiliary magnetic film for recording, magnetic film for recording, non-magnetic material film, in-plane magnetization at room temperature, transition to perpendicular magnetization above critical temperature at first
Auxiliary magnetic film, non-magnetic material film, auxiliary magnetic film made of antiferromagnetic ferromagnetic transition magnetic material, second auxiliary functioning as a reproducing magnetic film that transitions to in-plane magnetization at room temperature to perpendicular magnetization at or above a critical temperature at room temperature A magneto-optical recording medium comprising a film layer such as a magnetic film and laminated in this order. 【請求項１７】 基板上に少なくとも記録用磁性膜と再
生用磁性膜を備え、記録用レーザ光を記録用磁性膜に照
射することによって記録する光磁気記録媒体おいて、前
記記録用磁性膜、非磁性材料膜、室温では面内磁化で臨
界温度以上で垂直磁化に転移する第１の補助磁性膜、非
磁性材料膜、副格子磁化の方向が常温で膜面に対して平
行であり，再生光の照射によって膜面に垂直な磁化へ転
移する反強磁性強磁性遷移磁性材料からなる補助磁性
膜、室温では面内磁化で臨界温度以上で垂直磁化に転移
する再生用磁性膜として機能する第２の補助磁性膜等の
膜層を備えると共に、この順に積層構成されることを特
徴とする光磁気記録媒体。17. A magneto-optical recording medium comprising at least a recording magnetic film and a reproducing magnetic film on a substrate, wherein recording is performed by irradiating the recording magnetic film with a recording laser beam. Non-magnetic material film, first auxiliary magnetic film which transitions to perpendicular magnetization above critical temperature due to in-plane magnetization at room temperature, non-magnetic material film, direction of sub-lattice magnetization is parallel to the film surface at room temperature. Auxiliary magnetic film made of an antiferromagnetic ferromagnetic transition magnetic material that transitions to magnetization perpendicular to the film surface by light irradiation, and functions as a reproducing magnetic film that transitions to perpendicular magnetization at a temperature above the critical temperature due to in-plane magnetization at room temperature 2. A magneto-optical recording medium, comprising: a film layer such as a second auxiliary magnetic film;
JP29059997A 1997-10-23 1997-10-23 Magneto-optical record medium and its recording and reproducing method Withdrawn JPH11126384A (en)

Priority Applications (1)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29059997A JPH11126384A (en) 1997-10-23 1997-10-23 Magneto-optical record medium and its recording and reproducing method

Publications (1)

Publication Number Publication Date
JPH11126384A true JPH11126384A (en) 1999-05-11

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ID=17758099

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002065465A1 (en) * 2001-02-14 2002-08-22 Fujitsu Limited Magnetooptic recording medium
EP1498891A1 (en) * 2002-04-22 2005-01-19 Fujitsu Limited Optical recording medium, magnetooptic recording medium, information recording/reproducing device, information recording/reproducing method and magnetic recording device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002065465A1 (en) * 2001-02-14 2002-08-22 Fujitsu Limited Magnetooptic recording medium
US6844083B2 (en) 2001-02-14 2005-01-18 Fujitsu Limited Magneto-optical recording medium possessing a magnetic assist layer
EP1498891A1 (en) * 2002-04-22 2005-01-19 Fujitsu Limited Optical recording medium, magnetooptic recording medium, information recording/reproducing device, information recording/reproducing method and magnetic recording device
EP1498891A4 (en) * 2002-04-22 2008-08-06 Fujitsu Ltd Optical recording medium, magneto-optical recording medium, information recording/ reading-out apparatus, method for recording/reading-out information and magnetic recording apparatus

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