JPS5923014B2 - Magneto-optical recording and reproducing method - Google Patents
Magneto-optical recording and reproducing methodInfo
- Publication number
- JPS5923014B2 JPS5923014B2 JP2557079A JP2557079A JPS5923014B2 JP S5923014 B2 JPS5923014 B2 JP S5923014B2 JP 2557079 A JP2557079 A JP 2557079A JP 2557079 A JP2557079 A JP 2557079A JP S5923014 B2 JPS5923014 B2 JP S5923014B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- thin film
- magnetic layer
- light beam
- magneto
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
Description
【発明の詳細な説明】
本発明は、光磁気記録再生方法の改良に関するものであ
り、特に、高抗磁力の磁性材料からなる磁性層と低抗磁
力の磁性材料からなる磁性薄膜とを密接させて組合わせ
た磁気記録層に外部磁界を印加するとともに光ビームを
照射して高密度記録を行なうようにした光磁気記録再生
方法の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a magneto-optical recording and reproducing method, and in particular, a magnetic layer made of a magnetic material with high coercive force and a magnetic thin film made of a magnetic material with low coercive force are brought into close contact with each other. The present invention relates to an improvement in a magneto-optical recording and reproducing method in which high-density recording is performed by applying an external magnetic field to a combined magnetic recording layer and irradiating a light beam.
この種光磁気記録方法は、本来、レーザ光などの極めて
微小な光ビームのスポットにより磁性層中の微小区域の
温度を局部的に変化させ、印加磁界もしくは照射光ビー
ムの強度を情報信号により変調して情報信号に対応した
パターンをなす高密度の熱磁気記録を行なうようにした
ものである。This type of magneto-optical recording method originally uses an extremely small spot of a light beam such as a laser beam to locally change the temperature of a minute area in the magnetic layer, and modulates the applied magnetic field or the intensity of the irradiated light beam using an information signal. This system is designed to perform high-density thermomagnetic recording in a pattern corresponding to an information signal.
一方、均質な磁性層を得ることが容易であるがために高
密度の磁気記録を行なうに適した高抗磁力の磁性粉塗布
形磁性層は、その粉状性によつて光ビームが散乱するた
めに照射スポットにぼけが生ずるので、光ビームによる
高密度の記録再生、特に再生が充分満足な性能をもつて
行ない難いという欠点があつた。しかして、かかる磁性
粉塗布形磁性層をフィルム状もしくはシート状の透明な
ベース上に設けた磁気記録媒体に対して行なう従来の光
磁気記録方法は、第1図乃至第3図に示すような構成配
置によつて行なわれていたがために、いずれも、充分満
足な結果が得られなかつた。On the other hand, magnetic powder-coated magnetic layers with high coercive force, which are suitable for high-density magnetic recording because it is easy to obtain a homogeneous magnetic layer, scatter light beams due to their powdery nature. As a result, the irradiation spot becomes blurred, making it difficult to perform high-density recording and reproduction, especially reproduction, with sufficiently satisfactory performance using a light beam. However, the conventional magneto-optical recording method for a magnetic recording medium in which such a magnetic powder-coated magnetic layer is provided on a transparent base in the form of a film or sheet is as shown in FIGS. 1 to 3. However, due to the different configurations and arrangements used, fully satisfactory results could not be obtained in either case.
すなわち、第1図に示す構成配置の光磁気記録再生方法
においては、透明なベース1上に設けた磁性粉塗布形磁
性層2からなる磁気記録媒体に対し、磁性層2に磁気ヘ
ッド4を接触させて磁界を印加するとともに、磁性層2
の磁界印加区域にレーザ光3をレンズ9により収束させ
て照射するようにしており、また、第2図に示す構成配
置の光磁気記録再生方法においては、上述した磁気記録
媒体に対する磁界印加と光ビーム照射の方向を入れ替え
、また、再生は別の磁気ヘッド5のみにより磁気的に行
なうほかは、第1図示のものと同様にしている。That is, in the magneto-optical recording and reproducing method having the configuration shown in FIG. At the same time, a magnetic field is applied to the magnetic layer 2.
The laser beam 3 is converged and irradiated by a lens 9 onto the magnetic field application area of The structure is the same as that shown in FIG. 1, except that the direction of beam irradiation is changed and reproduction is carried out magnetically only by another magnetic head 5.
しかして、第1図に示した従来の光磁気記録再生方法に
おいては、少なくとも記録時における磁界印加と光ビー
ム照射とが磁気記録媒体の表裏両面に分れて行なわれる
がために、再生時に分離損失を伴うので、高密度記録を
行なうのが困難であり、また、第1図、第2図に示した
従来の方法には、いずれも接触型の磁気ヘツドを用いて
いるがために、上述のように磁界印加と光ビーム照射と
を分離せざるを得ないだけではなく、記録媒体と磁気ヘ
ツドとの接触に起因する信頼性の低下およびアクセス性
能の劣化が避けられない、という欠点があつた。さらに
、これらの光磁気記録再生方法においては、磁性粉塗布
形磁性層2を光ビームにより直接に照射しているために
、前述した光ビームの散乱による照射スポツトにぼけが
生じ、特に再生時に支障を来たすので、第2図示の例に
示したように、再生には磁気ヘツドのみによる磁気的再
生を行なわざるを得ない欠点があつた。かかる磁性粉塗
布形磁性層2による光ビーム散乱の問題を解決するため
に、第3図に示すように構成配置した従来の光磁気記録
再生方法においては、硝子板などからなる透明基板7上
に蒸着等により良好な粒状性をもつて被着形成した低抗
磁力の磁性薄膜6の上に磁性粉塗布形磁性層2を設け、
その磁性層2に接する磁気ヘツド4により外部磁界を印
加することにより記録を行ない、その磁性層2の磁化区
域に対応して磁化された磁性薄膜6の微小区域をレーザ
光ビーム3により照射して得られる反射光ビームをレン
ズ9を介して取出し、光磁気再生を行なうようにしてい
る。However, in the conventional magneto-optical recording and reproducing method shown in FIG. 1, at least the application of a magnetic field and the irradiation of a light beam during recording are performed separately on both the front and back surfaces of the magnetic recording medium. Since this involves loss, it is difficult to perform high-density recording, and since the conventional methods shown in FIGS. 1 and 2 both use contact-type magnetic heads, the above-mentioned Not only is it necessary to separate the magnetic field application from the light beam irradiation, as in the case of Ta. Furthermore, in these magneto-optical recording and reproducing methods, since the magnetic powder-coated magnetic layer 2 is directly irradiated with a light beam, the irradiated spot is blurred due to the aforementioned scattering of the light beam, which poses a problem especially during reproduction. Therefore, as shown in the example shown in the second figure, there is a drawback that magnetic reproduction must be performed only by a magnetic head. In order to solve the problem of light beam scattering caused by the magnetic layer 2 coated with magnetic powder, in the conventional magneto-optical recording and reproducing method configured and arranged as shown in FIG. A magnetic powder-coated magnetic layer 2 is provided on a low coercive force magnetic thin film 6 formed by vapor deposition or the like with good granularity.
Recording is performed by applying an external magnetic field with the magnetic head 4 in contact with the magnetic layer 2, and a minute area of the magnetic thin film 6 magnetized corresponding to the magnetized area of the magnetic layer 2 is irradiated with the laser beam 3. The resulting reflected light beam is extracted through a lens 9 for magneto-optical reproduction.
かかる第3図示の従来の光磁気記録再生方法においては
、磁性粉塗布形磁性層2を光ビーム3により直接に照射
することがないので、前述した光ビームの散乱による支
障は生じないが、通常の磁気ヘツドにより外部磁界を印
加しているがために、第1図乃至第2図に示した従来方
法と同様に、磁界印加と光ビーム照射との分離に伴う分
離損失、磁気ヘツドと記録媒体との接触に起因する信頼
性およびアクセス性能の低下等の従来の欠点が生ずるこ
とを免れ得ず、さらに、磁性薄膜6を透過した入射光ビ
ームが磁性層2に達することによる前述した光ビーム散
乱の悪影響も避け得ず、なお、充分な性能の高密度光磁
気記録および再生を行なうことは困難であつた。本発明
の目的は、土述した従来の欠点を除去して困難を排除し
、磁界印加と光ビーム照射との分離損失や磁気ヘツドの
接触に起因する性能の低下を伴うことなく、十分に満足
し得る性能の高密度記録および再生を行ない得るように
した光磁気記録再生方法を提供することにある。In the conventional magneto-optical recording and reproducing method shown in FIG. 3, since the magnetic powder-coated magnetic layer 2 is not directly irradiated with the light beam 3, the above-mentioned problem due to scattering of the light beam does not occur. Since the external magnetic field is applied by a magnetic head, similar to the conventional method shown in Figs. In addition, the above-mentioned light beam scattering caused by the incident light beam transmitted through the magnetic thin film 6 reaching the magnetic layer 2 cannot be avoided. However, it has been difficult to perform high-density magneto-optical recording and reproduction with sufficient performance. The object of the present invention is to eliminate the above-mentioned drawbacks and difficulties of the prior art, and to fully satisfy the problem without deterioration in performance due to separation loss between magnetic field application and light beam irradiation or contact between magnetic heads. The object of the present invention is to provide a magneto-optical recording and reproducing method that enables high-density recording and reproducing with the performance that is possible.
すなわち、本発明光磁気記録再生方法は、外部磁界の印
加に中空の環状磁気ヘツドを用いて光ビーム照射との分
離損失を除去し、高抗磁力の磁性粉塗布形磁性層と低抗
磁力の磁性薄膜との間に金属薄膜を介在させて磁性薄膜
を透過した光ビームが磁性粉塗布層に達しないようにし
て光ビームの散乱を防止するとともに入射光ビームを反
射させて磁性薄膜からの光磁気再生の性能を向上させる
ようにしたものであり、基板上に高抗磁力の磁性材料か
らなる磁性層を設け、その磁性層上に反射鏡をなす金属
薄膜を設け、その金属薄膜上に前記磁性層より高い温度
拡散率を有する低抗磁力の磁性薄膜を設けてなる磁気記
録媒体に対し、前記磁性薄膜を設けた側から、磁界を印
加するとともに光ビームを照射して少なくとも前記磁性
薄膜に生じた熱を前記金属薄膜を介し前記磁性層へ伝導
することにより、それら磁界および光ビームの少なくと
も一方の強さを情報信号に応じ変化させてその情報信号
を前記磁性層に記録し、反射光ビームの強度変化を検出
して前記情報信号を再生するようにしたことを特徴とす
るものである。That is, the magneto-optical recording and reproducing method of the present invention uses a hollow annular magnetic head to apply an external magnetic field to eliminate separation loss from light beam irradiation, and uses a magnetic powder-coated magnetic layer with high coercive force and a low coercive force. A metal thin film is interposed between the magnetic thin film to prevent the light beam transmitted through the magnetic thin film from reaching the magnetic powder coated layer to prevent the light beam from scattering, and to reflect the incident light beam to prevent light from the magnetic thin film. It is designed to improve the performance of magnetic reproduction, and a magnetic layer made of a magnetic material with high coercive force is provided on the substrate, a thin metal film serving as a reflecting mirror is provided on the magnetic layer, and the above-mentioned A magnetic field is applied to a magnetic recording medium provided with a low coercive magnetic thin film having a higher temperature diffusivity than the magnetic layer and a light beam is applied to at least the magnetic thin film from the side where the magnetic thin film is provided. By conducting the generated heat to the magnetic layer through the metal thin film, the intensity of at least one of the magnetic field and the light beam is changed according to the information signal, and the information signal is recorded in the magnetic layer, and the reflected light is The present invention is characterized in that the information signal is reproduced by detecting changes in the intensity of the beam.
以下図面を参照して実施例につき本発明を詳細に説明す
る。Hereinafter, the present invention will be explained in detail with reference to embodiments with reference to the drawings.
第4図に示す構成配置による本発明光磁気記録再生方法
の実施例においては、硝子板などからなる透明基板7上
に蒸着等により低抗磁力の磁性材料、例えば鉄などから
なる磁性薄膜6を被着形成し、その磁性薄膜6上に例え
ば銀等の金属薄膜8を被着形成する。In the embodiment of the magneto-optical recording and reproducing method of the present invention having the configuration shown in FIG. 4, a magnetic thin film 6 made of a magnetic material with low coercive force, such as iron, is formed by vapor deposition or the like on a transparent substrate 7 made of a glass plate or the like. A metal thin film 8 of, for example, silver is deposited on the magnetic thin film 6.
一方、高分子合成樹脂材等からなるベース1土に、例え
ば酸化クロムCrO2等の磁性粉塗布形磁性層2を被着
したものを、その磁性層2と上述の金属薄膜8とが接す
るように対向配置して、周知慣用の手段により互いに密
着させ、磁性薄膜6と磁性粉塗布形磁性層2とが金属薄
膜8を介して密接した構造の磁気記録媒体を形成する。
かかる構造の磁気記録媒体においては、磁性薄膜6と磁
性層2とが極微小の均一な間隔をもつて広い面積にわた
り密接し、その両者間に、蒸着等により極めて薄く形成
したがために、厚さ方向には良好に熱を伝導するも面積
方向には熱を伝導し難くし、しかも、良好な反射面をな
す金属薄膜が双方に密着して介在した構成となつている
。かかる構成の磁気記録媒体に対し、その透明基板7の
側に近接離隔して、図示のように中空環状に構成した磁
気ヘツド4を配置し、広い範囲にわたり、充分に磁性層
2にまで及ぶ磁界を印加するとともに、同じ透明基板1
の側から、上述した磁気ヘツド4の中空部を貫通して印
加磁界の中心部に位置する磁性薄膜6と金属薄膜8との
境界面にレンズ9により収束するようにしてレーザ光ビ
ーム3を入射させる。かかる第4図示の構成配置におい
ては、入射レーザ光ビーム3が磁性薄膜6およびこれに
密接した金属薄膜8の微小区域の温度を局部的に急上昇
させ、その加熱区域からの熱伝導によつて金属薄膜8に
密接した磁性粉塗布形磁性層2の微小区域の温度も上昇
する。On the other hand, a magnetic powder-coated magnetic layer 2 of chromium oxide CrO2 or the like is applied to a base 1 made of a polymeric synthetic resin material, etc., so that the magnetic layer 2 and the metal thin film 8 mentioned above are in contact with each other. The magnetic thin film 6 and the magnetic powder-coated magnetic layer 2 are disposed facing each other and brought into close contact with each other by well-known and commonly used means to form a magnetic recording medium having a structure in which the magnetic thin film 6 and the magnetic powder-coated magnetic layer 2 are in close contact with each other with the metal thin film 8 interposed therebetween.
In a magnetic recording medium having such a structure, the magnetic thin film 6 and the magnetic layer 2 are in close contact with each other over a wide area with extremely small uniform intervals, and because the thin film 6 and the magnetic layer 2 are formed extremely thinly by vapor deposition or the like between them, the thickness is small. It conducts heat well in the horizontal direction, but makes it difficult to conduct heat in the area direction, and has a structure in which a metal thin film that forms a good reflective surface is closely interposed on both sides. For a magnetic recording medium having such a configuration, a magnetic head 4 configured in a hollow annular shape as shown in the figure is arranged close to and spaced apart from the transparent substrate 7 side, and a magnetic field is generated over a wide range and sufficiently reaches the magnetic layer 2. At the same time, the same transparent substrate 1
A laser beam 3 is incident from the above-mentioned side through the hollow part of the magnetic head 4 so as to be focused by a lens 9 on the interface between the magnetic thin film 6 and the metal thin film 8 located at the center of the applied magnetic field. let In the configuration shown in FIG. 4, the incident laser beam 3 causes the temperature of a small area of the magnetic thin film 6 and the metal thin film 8 in close contact with the magnetic thin film 6 to locally rise rapidly, and the metal is heated by heat conduction from the heated area. The temperature of the minute area of the magnetic layer 2 coated with magnetic powder that is in close contact with the thin film 8 also increases.
しかして、磁性層2は、かかる温度上昇により、比較的
微弱な磁界中においても容易に磁化し得る高抗磁力の磁
性材料からなつているので、上述した磁気ヘツド4によ
る磁界中にあるレーザ光ビーム3の収束スポツト径と同
程度の微小区域に、印加磁界強度もしくは入射光強度を
変調することによる情報信号の高密度熱磁気記録を行な
うことができる。上述のようにして情報信号に応じたパ
ターンの磁化が磁性層2中に行なわれると、その磁性層
2に極めて薄い非磁性金属膜8を介して密接している磁
性薄膜6にその磁化パターンが転写されるので、上述の
ようにして熱磁気記録を行なつた磁気記録媒体からの記
録信号の再生にあたつては、記録時におけると同様にし
て行なつたレーザ光ビーム3の照射に対する金属薄膜8
からの鏡面反射光の、磁性薄膜6の転写磁化によつて呈
する磁気光学効果、すなわち、磁気カー効果もしくはフ
アラデ一効果により光磁気再生を行なう。Since the magnetic layer 2 is made of a magnetic material with high coercive force that can be easily magnetized even in a relatively weak magnetic field due to such a temperature increase, the laser beam in the magnetic field from the magnetic head 4 described above can be easily magnetized even in a relatively weak magnetic field. High-density thermomagnetic recording of information signals can be performed in a minute area comparable to the convergence spot diameter of the beam 3 by modulating the applied magnetic field intensity or the incident light intensity. When the magnetic layer 2 is magnetized in a pattern according to the information signal as described above, the magnetization pattern is transferred to the magnetic thin film 6 that is in close contact with the magnetic layer 2 through the extremely thin non-magnetic metal film 8. Therefore, when reproducing a recorded signal from a magnetic recording medium on which thermomagnetic recording has been performed as described above, the metal is irradiated with the laser beam 3 in the same manner as during recording. thin film 8
Magneto-optical reproduction is performed by the magneto-optic effect produced by the transfer magnetization of the magnetic thin film 6 of the specularly reflected light from the magnetic field, that is, the magnetic Kerr effect or Farade effect.
かかる光磁気再生にあたつては、金属薄膜8が読出し光
ビームに対する反射鏡として作用し、再生のための磁気
光学効果を増大させて再生効率を向上させるのみならず
、磁性粉塗布層への光ビームの透過を遮断して前述した
光ビーム散乱による性能劣化を防止するという格別の効
果が得られる。なお、上述した第4図示の構成配置にお
ける磁性層2として、例えばキユリ一温度130℃の酸
化クロムCrO2など、キユリ一温度が比較的低い高抗
磁力の磁性粉塗布形磁性層を用い、磁性薄膜6としては
、磁性層2に比してキユリ一温度が高く、50エルステ
ツド以下程度の低抗磁力を有する磁性材料、例えば鉄な
どからなる、例えば500λ程度の膜厚を有する磁性薄
膜を用い、また、金属薄膜8としては、反射率の良好な
極めて薄い金属薄膜、例えば膜厚300λの銀薄膜を用
いた場合には、ビツト径10μm以下程度の高密度記録
を行なうことができた。In such magneto-optical reproduction, the metal thin film 8 acts as a reflecting mirror for the readout light beam, not only increasing the magneto-optic effect for reproduction and improving reproduction efficiency, but also preventing the magnetic powder from being applied to the layer coated with magnetic powder. The special effect of blocking the transmission of the light beam and preventing the performance deterioration due to the above-mentioned light beam scattering can be obtained. As the magnetic layer 2 in the above-described configuration shown in the fourth figure, a magnetic powder-coated magnetic layer having a high coercive force and a relatively low Curing temperature, such as chromium oxide CrO2 having a Curing temperature of 130° C., is used, and a magnetic thin film is used. As the magnetic layer 6, a magnetic thin film having a thickness of about 500λ, for example, made of a magnetic material such as iron, which has a higher Curing temperature than the magnetic layer 2 and has a low coercive force of about 50 oersted or less, is used; When an extremely thin metal film with good reflectance, for example a silver thin film with a film thickness of 300λ, was used as the metal thin film 8, high density recording with a bit diameter of about 10 μm or less could be performed.
また、磁性薄膜6のみを、上述の構成とは異ならせ、記
録時の照射レーザ光3の波長に対して透明であり、しか
も、抗磁力が10エルステツド以下程度と極めて低い磁
性薄膜、例えば膜厚1μmの磁性ガーネツト薄膜とした
場合にも、上述したと同様の高密度記録および再生を行
なうことができた。以上の説明から明らかなように、本
発明によれば、磁性粉塗布形磁性層を有する高抗磁力の
磁気記録媒体に対する情報信号の記録および再生をとも
にレーザ光ビームを用いて光磁気的に行なうことができ
、十分な性能をもつて高密度の記録および再生を実現し
得るのみならず、完全な非接触型の記録および再生を行
ない得るので、メモリシステムの信頼性向上に適用する
ことができる。In addition, only the magnetic thin film 6 has a different structure from the above-described structure, and is made of a magnetic thin film that is transparent to the wavelength of the irradiated laser beam 3 during recording and has an extremely low coercive force of about 10 oersted or less, for example, Even when a magnetic garnet thin film of 1 μm was used, high-density recording and reproduction similar to that described above could be performed. As is clear from the above description, according to the present invention, recording and reproducing information signals on a high coercive force magnetic recording medium having a magnetic layer coated with magnetic powder are both performed magneto-optically using a laser beam. Not only can it achieve high-density recording and playback with sufficient performance, it can also perform completely contactless recording and playback, so it can be applied to improving the reliability of memory systems. .
また、磁気記録媒体の磁気特性の温度変化を利用した記
録方法においては、一般に、磁気記録媒体の温度変化が
急峻である程、高速度の記録が可能であるが、本発明に
よる第4図示の構成配置における磁性粉塗布形磁性層2
と蒸着膜等からなる磁性薄膜6との温度拡散率を比較す
ると、前者の温度拡散率が10−3cd/S程度である
のに対して、後者の温度拡散率は10−1cd/S程度
と格段に大きく、したがつて、後者すなわち磁性薄膜6
の方が遥かに急速に温度変化を生ずるので、上述したよ
うに金属薄膜8の介在により、極めて効率よく、磁性薄
膜6の方にまず温度変化をおこさせれば、極めて高速度
にレーザ光照射による熱磁気記録を行なうことができる
。したがつて、本発明光磁気記録再生方法は、高速度、
かつ高密度の磁気記録が可能であつて、しかも高速アク
セスが可能な高信頼性を有する記録再生装置を実現させ
るものであり、例えば編集用画像記録再生装置等、広い
技術分野に応用することができる。Furthermore, in a recording method that utilizes a temperature change in the magnetic properties of a magnetic recording medium, generally speaking, the steeper the temperature change of the magnetic recording medium, the higher the recording speed is possible. Magnetic powder coated magnetic layer 2 in configuration arrangement
Comparing the thermal diffusivity of the magnetic thin film 6 made of a vapor-deposited film or the like, the former has a thermal diffusivity of about 10-3 cd/S, while the latter has a thermal diffusivity of about 10-1 cd/S. The latter, that is, the magnetic thin film 6
Since the temperature changes much more rapidly in the magnetic thin film 6, as mentioned above, if the temperature change is first caused in the magnetic thin film 6 very efficiently through the intervention of the metal thin film 8, the temperature change due to the laser beam irradiation can be caused extremely rapidly. Thermomagnetic recording can be performed. Therefore, the magneto-optical recording and reproducing method of the present invention provides high speed,
The present invention realizes a highly reliable recording and reproducing device that is capable of high-density magnetic recording and high-speed access, and can be applied to a wide range of technical fields, such as image recording and reproducing devices for editing. can.
第1図乃至第3図は従来の光磁気記録再生方法の構成配
置をそれぞれ示す断面図、第4図は本発明光磁気記録再
生方法の構成配置の例を示す断面図である。
1・・・・・・ベース、2・・・・・・磁性層、3・・
・・・・レーザ光ビーム、4,5・・・・・・磁気ヘツ
ド、6・・・・・・磁性薄膜、7・・・・・・透明基板
、8・・・・・・金属薄膜、9,9/・・・・・・レン
ズ。1 to 3 are cross-sectional views showing the arrangement of a conventional magneto-optical recording and reproducing method, respectively, and FIG. 4 is a cross-sectional view showing an example of the arrangement of the magneto-optical recording and reproducing method of the present invention. 1...Base, 2...Magnetic layer, 3...
... Laser light beam, 4, 5 ... Magnetic head, 6 ... Magnetic thin film, 7 ... Transparent substrate, 8 ... Metal thin film, 9,9/...Lens.
Claims (1)
、その磁性層上に反射鏡をなす金属薄膜を設け、その金
属薄膜上に前記磁性層より高い温度拡散率を有する低抗
磁力の磁性薄膜を設けてなる磁気記録媒体に対し、前記
磁性薄膜を設けた側から、磁界を印加するとともに光ビ
ームを照射して少なくとも前記磁性薄膜に生じた熱を前
記金属薄膜を介し前記磁性層へ伝導することにより、そ
れら磁界および光ビームの少なくとも一方の強さを情報
信号に応じ変化させてその情報信号を前記磁性層に記録
し、反射光ビームの強度変化を検出して前記情報信号を
再生するようにしたことを特徴とする光磁気記録再生方
法。1 A magnetic layer made of a magnetic material with high coercive force is provided on a substrate, a thin metal film forming a reflecting mirror is provided on the magnetic layer, and a thin metal film with a low coercive force having a higher temperature diffusivity than the magnetic layer is provided on the thin metal film. A magnetic field is applied to a magnetic recording medium provided with a magnetic thin film from the side on which the magnetic thin film is provided, and a light beam is irradiated to transfer the heat generated in at least the magnetic thin film to the magnetic layer through the metal thin film. By conduction, the intensity of at least one of the magnetic field and the light beam is changed according to the information signal, the information signal is recorded in the magnetic layer, and the information signal is reproduced by detecting the change in the intensity of the reflected light beam. A magneto-optical recording and reproducing method characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2557079A JPS5923014B2 (en) | 1979-03-07 | 1979-03-07 | Magneto-optical recording and reproducing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2557079A JPS5923014B2 (en) | 1979-03-07 | 1979-03-07 | Magneto-optical recording and reproducing method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55122244A JPS55122244A (en) | 1980-09-19 |
JPS5923014B2 true JPS5923014B2 (en) | 1984-05-30 |
Family
ID=12169581
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2557079A Expired JPS5923014B2 (en) | 1979-03-07 | 1979-03-07 | Magneto-optical recording and reproducing method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5923014B2 (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5778652A (en) * | 1980-11-01 | 1982-05-17 | Daido Steel Co Ltd | Thermal magnetic recording carrier and thermal magnetic recording system |
JPS5843078A (en) * | 1981-09-08 | 1983-03-12 | Omron Tateisi Electronics Co | Memory card |
JPS5844586A (en) * | 1981-09-09 | 1983-03-15 | Omron Tateisi Electronics Co | Magnetic card device |
JPS5857646A (en) * | 1981-10-01 | 1983-04-05 | Akai Electric Co Ltd | Vertical magnetic recording and reproducing method |
JPS5883346A (en) * | 1981-11-10 | 1983-05-19 | Kokusai Denshin Denwa Co Ltd <Kdd> | Photomagnetic recording medium |
JPS6129438A (en) * | 1984-07-19 | 1986-02-10 | Sony Corp | Magnetic recorded light reproducer |
JPS63117354A (en) * | 1986-11-05 | 1988-05-21 | Canon Inc | Magneto-optical recording medium |
US5105408A (en) * | 1988-05-12 | 1992-04-14 | Digital Equipment Corporation | Optical head with flying lens |
US5022018A (en) * | 1989-02-16 | 1991-06-04 | Minnesota Mining And Manufacturing Company | System for applying a perpendicular magnetic field to the illuminated side of a magneto-optic medium |
US5161134A (en) * | 1989-06-29 | 1992-11-03 | Digital Equipment Corporation | Method for increasing linear bit density in magneto-optical storage media |
US5287334A (en) * | 1989-07-29 | 1994-02-15 | Sony Corporation | Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus |
JPH03122855A (en) * | 1989-10-06 | 1991-05-24 | Fuji Xerox Co Ltd | Floating head for magneto-optical recording type recorder |
US5124961A (en) * | 1989-12-28 | 1992-06-23 | Fuji Xerox Co., Ltd. | Floating head for use with a recording apparatus of magneto-optical memory device |
US5392263A (en) * | 1990-01-31 | 1995-02-21 | Sony Corporation | Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens |
JP2861188B2 (en) * | 1990-01-31 | 1999-02-24 | ソニー株式会社 | Magneto-optical recording / reproducing device |
JPH03225650A (en) * | 1990-01-31 | 1991-10-04 | Sony Corp | Optical disk system |
JPH03198242A (en) * | 1990-05-30 | 1991-08-29 | Sharp Corp | Magneto-optical recording and reproducing device |
US5910932A (en) * | 1991-09-11 | 1999-06-08 | Sony Corporation | Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk |
JP2726249B2 (en) * | 1995-10-25 | 1998-03-11 | ソニー株式会社 | Magnetic recording optical reproducing device |
-
1979
- 1979-03-07 JP JP2557079A patent/JPS5923014B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS55122244A (en) | 1980-09-19 |
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