JPS63841A - Magneto-optical memory element - Google Patents
Magneto-optical memory elementInfo
- Publication number
- JPS63841A JPS63841A JP16067187A JP16067187A JPS63841A JP S63841 A JPS63841 A JP S63841A JP 16067187 A JP16067187 A JP 16067187A JP 16067187 A JP16067187 A JP 16067187A JP S63841 A JPS63841 A JP S63841A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- film
- magneto
- tracks
- reflective film
- 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.)
- Granted
Links
- 239000010408 film Substances 0.000 claims description 36
- 230000005291 magnetic effect Effects 0.000 claims description 10
- 239000010409 thin film Substances 0.000 claims description 3
- 230000005415 magnetization Effects 0.000 claims description 2
- 239000000758 substrate Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 230000005374 Kerr effect Effects 0.000 abstract description 4
- 239000000696 magnetic material Substances 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 abstract description 3
- 125000006850 spacer group Chemical group 0.000 abstract description 3
- 229910052681 coesite Inorganic materials 0.000 abstract description 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 2
- 229910052682 stishovite Inorganic materials 0.000 abstract description 2
- 229910052723 transition metal Inorganic materials 0.000 abstract description 2
- 229910052905 tridymite Inorganic materials 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract 2
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 229910052737 gold Inorganic materials 0.000 abstract 1
- 238000010030 laminating Methods 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000002902 ferrimagnetic material Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920003217 poly(methylsilsesquioxane) Polymers 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
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
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
- G11B11/10589—Details
Abstract
Description
【発明の詳細な説明】
く技術分野〉
本発明はレーザ光により情報の記録・再生・消去を行う
磁気光学記憶素子に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a magneto-optical storage element that records, reproduces, and erases information using laser light.
く従来技術〉
近年、高密度・大容量・高速アクセス等種々の要求を満
足し得る光メモリ装置の研究開発が活発に推進されてい
る。各種光メモリ装置のうちでも特に記憶材料として垂
直磁化膜を用いた磁気光学記憶装置は不要になった情報
を消去し新しい情報を再記録出来るという事から注目さ
れている。BACKGROUND ART In recent years, research and development of optical memory devices that can satisfy various demands such as high density, large capacity, and high speed access have been actively promoted. Among various optical memory devices, magneto-optical storage devices that use perpendicularly magnetized films as storage materials are attracting attention because they can erase information that is no longer needed and re-record new information.
しかし上記の利点を有する一方で磁気光学記憶装置は再
生信号レベルが低いという欠点があり、特に磁気光学記
憶素子からの反射光を利用して情報の再生を行う所謂カ
ー効果再生方式においてはカー回転角が小さいため信号
雑音比（Ｓ／Ｎ）を高める事が困難であった。その為従
来でに記録媒体である磁性材料を改良したジ或いは記録
媒体上にＳｉＯやＳ １０２の誘電体膜を形成したジし
てカー回転角を高める工夫がなされていた。そして後者
の例としてＭ ｎ Ｂ １磁性体膜上にＳｉＯ膜を形成
することにＬってカー回転角が０７度から３６度に増大
した例が報告されているＮ 、Ａｐｌ）１．Ｐｈｙｓ。However, while having the above-mentioned advantages, magneto-optical storage devices have the disadvantage of low reproduction signal levels, and in particular, in the so-called Kerr effect reproduction method in which information is reproduced using reflected light from magneto-optic storage elements, Kerr rotation Since the angle is small, it is difficult to increase the signal-to-noise ratio (S/N). For this reason, conventional efforts have been made to increase the Kerr rotation angle by improving the magnetic material of the recording medium or by forming a dielectric film of SiO or S102 on the recording medium. As an example of the latter, it has been reported that the Kerr rotation angle increased from 07 degrees to 36 degrees by forming a SiO film on a MnB1 magnetic film. Phys.
Ｖｏ１４５ ｎｏ８ Ａｕｇｕｓｔ１９７４）（、
しかしながらこのような磁性体膜上への誘電体膜の形成
でにカー回転角の増大に伴って反射光景が減退し実質的
なＳ／Ｎは約２倍程度にしか増大していない。又、Ｓｉ
ＯやＳ ｉ ０２等の誘電体膜を形成しただけで（１、
磁性体に腐蝕の恐れのある場合（・１その腐蝕の実質的
な防御とになり得ない事や記録ビア）径が１７ｚｍ程朋
であるため１１訓程度の小さなほこりやゴミが該誘電体
膜に何者した場合に該ビット検出が不可能になる事等の
ため、実質的な記録素子とするためには厚さ０５〜２．
０１程度のガラス又は透明樹脂を使用する事が望１しく
、そうする事に２つカー回転角の増大（従ってＳ／Ｎの
増大）の効果も理論値程の期待にできなくなった。Vo145 no8 August1974) (,
However, when a dielectric film is formed on such a magnetic film, as the Kerr rotation angle increases, the reflected image decreases, and the actual S/N only increases by about twice. Also, Si
By simply forming a dielectric film such as O or S i 02 (1,
If there is a risk of corrosion in the magnetic material (such as recording vias that cannot be a practical protection against corrosion), the diameter is about 17 mm, so small dust and dirt on the dielectric film If something happens to the bit, it will become impossible to detect the bit, so in order to make it a practical recording element, the thickness should be 0.5 to 2.
It is desirable to use glass or transparent resin of about 0.01, and by doing so, the effect of increasing the Kerr rotation angle (and thus increasing the S/N) cannot be expected as much as the theoretical value.
又、光メモリ装置は高密度記録が基本的な条件であるた
めその記録ビット径は上述したごとく１μｍ程度であり
従って記録・再生・消去の過程でフォーカスサーボ、ト
ラックサーボ等のサーボ技術が不可欠となる。さもない
と記録装置に複雑でかつ精巧なものとな！ｌｌ夫用には
適さなくなる。そして特にトラックサーボをかける場合
には、信号の記録トランクに隣接したサーボ用のガイド
トラックがある事が望ましい（特に記録・再生・消去を
行なうものでは必要である。）０
く目的〉
本発明は以上の点に鑑みなされたものであって、反射光
量を減らす事なく磁気光学効果を増大させしかもサーボ
用のガイドトラックをも形成することを目的とする。Furthermore, since high-density recording is a basic requirement for optical memory devices, the recording bit diameter is approximately 1 μm as mentioned above, and therefore servo technology such as focus servo and track servo is essential in the recording, reproducing, and erasing processes. . Otherwise, the recording device will be complicated and sophisticated! It is no longer suitable for husband use. Particularly when applying track servo, it is desirable to have a servo guide track adjacent to the signal recording trunk (this is especially necessary for recording, playback, and erasing). This was developed in view of the above points, and the object is to increase the magneto-optical effect without reducing the amount of reflected light, and also to form a guide track for servo.
く実施例〉
次に本発明の具体的な実施例を以下図面を参照しながら
詳説する。Embodiments> Next, specific embodiments of the present invention will be described in detail with reference to the drawings.
第１図は本発明の一実施例である磁気光学記憶素子の一
部拡大側面断面図である。FIG. 1 is a partially enlarged side sectional view of a magneto-optical memory element according to an embodiment of the present invention.
ガラス又は合成樹脂の基板ｌ上にＧｄＴｂＦｅ。GdTbFe on a glass or synthetic resin substrate.
ＳｍＴｂＦｅ、ＴｂＦｅ、ＧｄＤｙＦｅ、ＴｂＣｏ、Ｇ
ｄＣｏ等の希土類と遷移金属ニジなるアモルファスフェ
リ磁性体の垂直磁化膜を記録トラック２として帯状に形
成する。例えば磁気光学素子が円板である場合は記録ト
ランク２は同心円状もしくはらせん状をなす。記録トラ
ック２０間は空気、Ｎ２．Ａｒ等のガス体７で充填され
、記録トラック２の裏面には誘電体膜３が配される。該
誘電体膜３の裏面にはＡｔ、Ａｕ＋Ａｇ等の反射膜４が
ある。更に反射膜４に支持基板５上に被覆されるもので
いる。この構成においてガイドトラックは記録トラック
２の間のガス体部分である。即ち磁化膜２と反射膜４と
の反射率の相違にエフガイドトランクと記録トラック２
が区別されている。記録トラック２を形成する磁性膜２
は充分に薄く、従って磁性体層に入射した再生光は磁性
体面からの反射によるカー効果と磁性体膜を通ジ抜は反
射層４で反射され再び磁性体膜を通り抜けることで起こ
るファラディ効果が合わさることによって単なるカー効
果のみによる回転角に比べて数倍口転角が増大し、かつ
返り光量はほとんど減少しないためＳ／Ｎが大きく増大
するものである。SmTbFe, TbFe, GdDyFe, TbCo, G
A perpendicularly magnetized film of an amorphous ferrimagnetic material made of a rare earth metal such as dCo and a transition metal is formed in a strip shape as a recording track 2. For example, when the magneto-optical element is a disk, the recording trunk 2 has a concentric or spiral shape. Between the recording tracks 20 is air, N2. It is filled with a gas 7 such as Ar, and a dielectric film 3 is disposed on the back surface of the recording track 2 . On the back surface of the dielectric film 3 is a reflective film 4 made of At, Au+Ag, or the like. Furthermore, the reflective film 4 is coated on the supporting substrate 5. In this configuration the guide track is the gas body section between the recording tracks 2. That is, due to the difference in reflectance between the magnetized film 2 and the reflective film 4, the F-guide trunk and the recording track 2
are distinguished. Magnetic film 2 forming recording track 2
is sufficiently thin, so that the reproducing light incident on the magnetic layer has the Kerr effect due to reflection from the magnetic surface, and the Faraday effect that occurs when it passes through the magnetic film, is reflected by the reflective layer 4, and passes through the magnetic film again. By combining them, the rotation angle increases several times compared to the rotation angle due to mere Kerr effect alone, and the amount of reflected light hardly decreases, so the S/N ratio increases greatly.
以上素子の作５５．は次の様にして行なう。The above elements are made 55. is done as follows.
支持基板５の上に反射膜４．５１０２等の誘電体膜３を
形成し、更に垂直磁化膜による帯状の記録トラック２を
形成しその４層構造からなる記録素子と透明な保護板１
とをスペーサー６を介して重ね合わせる溝造をとる。そ
して記録トラックと保護板との間隙部７に空気、Ｎ ２
、 Ａ ｒ等のガスを充填する。A dielectric film 3 such as a reflective film 4.5102 is formed on the supporting substrate 5, and a strip-shaped recording track 2 is formed by a perpendicular magnetization film, and a recording element having a four-layer structure and a transparent protection plate 1 are formed.
A groove structure is used in which the two are overlapped with each other with a spacer 6 interposed therebetween. Air, N 2 is added to the gap 7 between the recording track and the protection plate.
, Fill with gas such as Ar.
この実施例において、ガイドトラックは記録トラック２
０間の透明な部分であり、記録トラック２と反射膜・１
との反射率の差に工９ガイドトラックと記録トラックと
の区別を行う０
以上の実施例の構成以外にも本発明の王旨の範囲内で種
々の構成の変更は可能である。In this embodiment, the guide track is recording track 2.
This is the transparent part between recording track 2 and reflective film 1.
In addition to the configurations of the above-described embodiments, various configurations can be made within the scope of the invention.
たとえば磁性体は上記のアモルファスフェリ磁性体に限
定されず〜ｆｎＢｉ、 ｍｎＢｉｃｕ、 ＥｕＯ等の結
晶性垂直磁化膜でも良い。For example, the magnetic material is not limited to the above-mentioned amorphous ferrimagnetic material, but may also be a crystalline perpendicularly magnetized film such as fnBi, mnBicu, or EuO.
又、上記実施例において磁性体膜による記録トラック２
と反射体膜４の間に誘電体膜３が形成されるが該誘電体
膜は記録トラック２に情報をレーザ光を用いて熱磁気記
録を行う時熱伝導により反射膜４に熱が逃げるのを防ぐ
ために設けられたものであり、レーザ光等のエネルギー
が充分の場合に誘電体膜はなくても良い。Further, in the above embodiment, the recording track 2 formed by the magnetic film is
A dielectric film 3 is formed between the reflector film 4 and the dielectric film 3, and the dielectric film prevents heat from escaping to the reflective film 4 by thermal conduction when thermomagnetic recording of information on the recording track 2 is performed using a laser beam. The dielectric film is provided to prevent this, and the dielectric film may not be provided if the energy of the laser beam or the like is sufficient.
更に記録トラック２やガイドトランクは必ずしも平行な
帯状である必要がなくトラック査号やトランクをセクタ
ーごとに分ける場合の情報を入れても良い。Furthermore, the recording track 2 and the guide trunk do not necessarily have to be in the form of parallel strips, and may include track codes or information for dividing the trunk into sectors.
本発明にもちろんその製造方法には依存しない、たとえ
ば記録トラックはエツチング法で形成しても強力なレー
ザ光等で形成してちかまわない。又第１図において基板
５の裏ａ＋１＋ Ｋ同様な同数の磁気光学記憶素子を形
成することで記録素子の両面を利用し記憶容量の倍増を
計る事も可能である。Of course, the present invention does not depend on the manufacturing method; for example, the recording tracks may be formed by an etching method or by a powerful laser beam or the like. Furthermore, by forming the same number of magneto-optical storage elements on the back side a+1+K of the substrate 5 in FIG. 1, it is also possible to double the storage capacity by utilizing both sides of the recording element.
く効果〉
以上説明した如く本発明にＬれば、反射膜上部に形成し
た帯状の磁性体薄膜の帯状体間に透明体を形成したこと
によってＳ／Ｎの良い信号が記録・再生されるものであ
って、しかもガイドトラックも形作られるという極めて
有効な構造の磁気光学記憶素子を提供できるものである
。Effect> As explained above, according to the present invention, signals with good S/N can be recorded and reproduced by forming a transparent body between the strips of the strip-shaped magnetic thin film formed on the top of the reflective film. Moreover, it is possible to provide a magneto-optical storage element having an extremely effective structure in which a guide track is also formed.
第１図は本発明に係わる磁気光学記憶素子の一実施例の
一部拡大側面断面図を示す。
図中、１：基板 ２：記録トラック ３：誘電体膜 ４
：反射膜 ５：支持基板 ６：スペーサ７：間隙部
代理人 弁理士 杉 山 毅 至 （他１名〕第 ｌ
図FIG. 1 shows a partially enlarged side cross-sectional view of an embodiment of a magneto-optic storage element according to the present invention. In the figure, 1: Substrate 2: Recording track 3: Dielectric film 4
: Reflective film 5: Support substrate 6: Spacer 7: Gap agent Patent attorney Takeshi Sugiyama (and 1 other person) No. 1
figure
Claims (1)
垂直磁化容易軸を有する磁性体薄膜と、該薄膜の帯状体
間にガス体を形成したことを特徴とする磁気光学記憶素
子。1. A magneto-optical memory element comprising a reflective film, a magnetic thin film having a perpendicular easy axis of magnetization formed in a strip shape above the reflective film, and a gas body formed between the strips of the thin film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16067187A JPS63841A (en) | 1987-06-26 | 1987-06-26 | Magneto-optical memory element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16067187A JPS63841A (en) | 1987-06-26 | 1987-06-26 | Magneto-optical memory element |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14915680A Division JPS5774852A (en) | 1980-10-23 | 1980-10-23 | Magnetic optical storing element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63841A true JPS63841A (en) | 1988-01-05 |
| JPH038023B2 JPH038023B2 (en) | 1991-02-05 |
Family
ID=15719964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16067187A Granted JPS63841A (en) | 1987-06-26 | 1987-06-26 | Magneto-optical memory element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63841A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02121135A (en) * | 1988-10-28 | 1990-05-09 | Sharp Corp | Optical memory element |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52156605A (en) * | 1976-06-18 | 1977-12-27 | Thomson Brandt | Data carrier and method of producing same |
| JPS531002A (en) * | 1976-05-13 | 1978-01-07 | Philips Corp | Radiation sensitive record |
| JPS5534340A (en) * | 1978-08-31 | 1980-03-10 | Nippon Hoso Kyokai <Nhk> | Recording reproducing system by light beam |
-
1987
- 1987-06-26 JP JP16067187A patent/JPS63841A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS531002A (en) * | 1976-05-13 | 1978-01-07 | Philips Corp | Radiation sensitive record |
| JPS52156605A (en) * | 1976-06-18 | 1977-12-27 | Thomson Brandt | Data carrier and method of producing same |
| JPS5534340A (en) * | 1978-08-31 | 1980-03-10 | Nippon Hoso Kyokai <Nhk> | Recording reproducing system by light beam |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02121135A (en) * | 1988-10-28 | 1990-05-09 | Sharp Corp | Optical memory element |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH038023B2 (en) | 1991-02-05 |
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