JPH01171137A - Magneto-optical recording medium - Google Patents

Magneto-optical recording medium

Info

Publication number
JPH01171137A
JPH01171137A JP32712587A JP32712587A JPH01171137A JP H01171137 A JPH01171137 A JP H01171137A JP 32712587 A JP32712587 A JP 32712587A JP 32712587 A JP32712587 A JP 32712587A JP H01171137 A JPH01171137 A JP H01171137A
Authority
JP
Japan
Prior art keywords
film
magnetic field
magnetic
magneto
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.)
Pending
Application number
JP32712587A
Other languages
Japanese (ja)
Inventor
Yoshio Suzuki
良夫 鈴木
Norio Ota
憲雄 太田
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Ltd filed Critical Hitachi Ltd
Priority to JP32712587A priority Critical patent/JPH01171137A/en
Publication of JPH01171137A publication Critical patent/JPH01171137A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00Recording 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
    • G11B11/10Recording 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
    • G11B11/105Recording 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
    • G11B11/10582Record carriers characterised by the selection of the material or by the structure or form
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00Recording 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
    • G11B11/10Recording 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
    • G11B11/105Recording 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

Abstract

PURPOSE:To impress a sufficiently large magnetic field even when a small magnetic field modulating coil is used by laminating and forming a transparent soft magnetic film and a vertical magnetizing film on a substrate in an above- mentioned order. CONSTITUTION:A magnetic head 5 and an optical head are placed on facing positions while sandwiching a recording medium in magnetic field modulating type magneto-optical recording. In such a case, when a transparent soft magnetic film 2 is provided between a substrate 1 and a vertical magnetizing film 3, since a magnetic flux is made to reflow through the film 2, the magnetic field is efficiently impressed to the vertical magnetizing 3. Thus, even when a current supplied to a coil of a magnetic head 5 is the same, the magnetic field to be impressed to the vertical magnetizing film 3 can be made larger in the case of a structure with the addition of the soft magnetic membrane 2.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、レーザ光を用いて情報の記録、再生。[Detailed description of the invention] [Industrial application field] The present invention uses laser light to record and reproduce information.

消去を行なう光磁気記録に係わり、特に、磁界変調方式
で記録を行なう、オーバーライド可能な光磁気記録に関
する。
The present invention relates to magneto-optical recording that performs erasing, and particularly relates to magneto-optical recording that performs recording using a magnetic field modulation method and is overridable.

〔従来の技術〕[Conventional technology]

光磁気ディスクは書き換え可能な大容量ファイルメモリ
として注目されている。光磁気記録の記録方式には、大
別して、光変調方式と磁界変調方式がある。このうち、
特公昭60−48806号に記載の磁界変調方式は、消
去と記録を同時に行なう、いわゆるオーバーライドが可
能であるために、書き込みに必要な時間を短縮できると
いう長所がある、磁界変調方式においては、光ヘッドと
磁気ヘッドは光磁気記録媒体をはさんで対向する位置に
置かれる。光ヘッドから、レーザ光が直流的に光磁気記
録媒体に照射され、記録膜の照射された部分がキュリー
点以上の温度に加熱される。この加熱部分に、磁気ヘッ
ドにより磁界に変換された情報が記録される。
Magneto-optical disks are attracting attention as rewritable large-capacity file memories. Recording methods for magneto-optical recording are broadly classified into optical modulation methods and magnetic field modulation methods. this house,
The magnetic field modulation method described in Japanese Patent Publication No. 60-48806 has the advantage of being able to perform so-called override, in which erasing and recording can be performed at the same time, thereby reducing the time required for writing. The head and the magnetic head are placed at opposite positions with the magneto-optical recording medium in between. A laser beam is directly irradiated onto the magneto-optical recording medium from the optical head, and the irradiated portion of the recording film is heated to a temperature higher than the Curie point. Information converted into a magnetic field by the magnetic head is recorded on this heated portion.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

ところで、磁界変調型光磁気記録において記録周波数を
大きくするためには、磁界変調用コイルのインダクタン
スを小さくしなければならず、そのためには、コイルの
大きさや巻線を小さくする必要がある。しかし、コイル
を小さくすると発生できる磁界は小さくなり、記録媒体
の磁化を反転させるのに不十分になる。という問題があ
った。
By the way, in order to increase the recording frequency in magnetic field modulation type magneto-optical recording, it is necessary to reduce the inductance of the magnetic field modulation coil, and for this purpose, it is necessary to reduce the size of the coil and the winding. However, if the coil is made smaller, the magnetic field that can be generated becomes smaller and becomes insufficient to reverse the magnetization of the recording medium. There was a problem.

本発明の目的は、小さな磁界変調コイルを用いても、十
分に大きな磁場が光磁気記録膜に印加され、高い周波数
での記録が可能な光磁気記録媒体を提供することにある
An object of the present invention is to provide a magneto-optical recording medium in which a sufficiently large magnetic field can be applied to a magneto-optical recording film and recording can be performed at a high frequency even when a small magnetic field modulation coil is used.

〔問題点を解決するための手段〕[Means for solving problems]

上記目的は、基板上に、透明軟磁性面内磁化膜、垂直磁
化膜を上記の順に積層してなる光磁気記録媒体を形成す
ることにより、達成される。
The above object is achieved by forming a magneto-optical recording medium in which a transparent soft magnetic in-plane magnetization film and a perpendicular magnetization film are laminated in the above order on a substrate.

〔作用〕[Effect]

第1図に本発明の原理を示す、磁界変調型光磁気記録に
おいては、磁気ヘッド5と光ヘッドは記録媒体をはさん
で対向する位置に置かれる。磁気ヘッド5により作り出
される磁束7は、従来の光磁気記録媒体においては、垂
直磁化膜3を通過した後に、非磁性の基板1や空気中を
大きく回ってから、元の磁気ヘッド5に還流するため、
磁束のエネルギーは分散してしまい、垂直磁化膜3に印
加される磁界は極めて小さくなってしまっていた。
In magnetic field modulation type magneto-optical recording, which shows the principle of the present invention in FIG. 1, a magnetic head 5 and an optical head are placed at opposing positions with a recording medium in between. In a conventional magneto-optical recording medium, the magnetic flux 7 generated by the magnetic head 5 passes through the perpendicular magnetization film 3, circulates around the non-magnetic substrate 1 and the air, and then returns to the original magnetic head 5. For,
The energy of the magnetic flux has been dispersed, and the magnetic field applied to the perpendicularly magnetized film 3 has become extremely small.

そこで、第1図に示すように、基板1と垂直磁化膜3と
の間に、軟磁性膜2を設けると、この膜を通じて磁束が
還流されるために、垂直磁化膜3に効率よく磁界が印加
される。このために、磁気ヘッド5のコイル6へ供給さ
れる電流が同一であっても、軟磁性膜2を加えた構造の
場合の方が、垂直磁化膜3に印加される磁界を大きくす
ることが可能となる。
Therefore, as shown in FIG. 1, if a soft magnetic film 2 is provided between the substrate 1 and the perpendicularly magnetized film 3, the magnetic flux is circulated through this film, so that the magnetic field is efficiently applied to the perpendicularly magnetized film 3. applied. For this reason, even if the current supplied to the coil 6 of the magnetic head 5 is the same, it is possible to increase the magnetic field applied to the perpendicularly magnetized film 3 in the structure in which the soft magnetic film 2 is added. It becomes possible.

〔実施例〕〔Example〕

以下、本発明の一実施例を第2図により説明する。ガラ
ス基板1上にRFスパッタ法によりY−F e −0系
非晶質酸化物磁性膜2を、4000人の厚さに成膜した
。その上に1000人厚のTbz2FeeoCoxg垂
直磁化膜3および2000人厚のSigNa保護膜4を
マグネトロンスパッタ法により成膜した。
An embodiment of the present invention will be described below with reference to FIG. A Y--Fe-0 amorphous oxide magnetic film 2 was formed to a thickness of 4000 mm on a glass substrate 1 by RF sputtering. Thereon, a Tbz2FeeoCoxg perpendicular magnetization film 3 with a thickness of 1000 μm and a SigNa protective film 4 with a thickness of 2000 μm were formed by magnetron sputtering.

第3図に上述のようにして作製した光磁気記録媒体に、
磁界変調方式により書込みを行なった場合の、搬送波対
雑音比(C/N比)を磁気ヘッド電流に対してプロット
した図を示す。書込み条件は、回転数180Orpm、
レーザ出力8mWである。同図かられかるように、C/
N比の立ち上がりの位置が、軟磁性膜のない光磁気記録
媒体の場合には250mAであったのに対して、軟磁性
膜を有する光磁気記録媒体を用いた場合には、150m
Aとなった。すなわち、実効的に垂直磁化膜に印加され
る磁界が、軟磁性膜の存在により、約1.7倍になった
。また、いずれの磁気ヘッド電流の領域においても、軟
磁性膜を有する光磁気記録媒体の方が、大きなC/N比
が得られた。
FIG. 3 shows the magneto-optical recording medium produced as described above.
A diagram in which the carrier-to-noise ratio (C/N ratio) is plotted against the magnetic head current when writing is performed using the magnetic field modulation method is shown. The writing conditions are rotation speed 180Orpm,
The laser output is 8 mW. As you can see from the same figure, C/
The rising position of the N ratio was 250 mA in the case of a magneto-optical recording medium without a soft magnetic film, whereas it was 150 mA in the case of a magneto-optical recording medium with a soft magnetic film.
It became A. That is, the magnetic field effectively applied to the perpendicularly magnetized film was increased by about 1.7 times due to the presence of the soft magnetic film. Further, in any range of magnetic head current, a larger C/N ratio was obtained in the magneto-optical recording medium having a soft magnetic film.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、磁界変調型光磁気記録における、垂直
磁化膜に印加される磁界を、従来方式の約1.7倍に増
大することが可能であった。これにともない、変調用磁
気ヘッドを小型のものにして、従来の光磁気記録媒体よ
りも、高速での書込みが可能となった。
According to the present invention, it was possible to increase the magnetic field applied to the perpendicularly magnetized film in magnetic field modulation type magneto-optical recording to about 1.7 times that of the conventional method. Along with this, the modulation magnetic head has been made smaller, and it has become possible to write at a higher speed than with conventional magneto-optical recording media.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明を用いた光磁気記録媒体への磁界変調記
録の原理説明図、第2図は本発明の一実施例の光磁気記
録媒体の縦断面図、第3図は本発明の実施例と従来例の
搬送波対雑音比(C/N)の磁気ヘッドコイルの交流電
流に対する依存特性図である。 1・・・基板、2・・・軟磁性膜、3・・・垂直磁化膜
、4・・・レンズ、5・・・磁気ヘッド、6・・・コイ
ル、7・・・磁束。
FIG. 1 is a diagram explaining the principle of magnetic field modulation recording on a magneto-optical recording medium using the present invention, FIG. 2 is a longitudinal cross-sectional view of a magneto-optical recording medium according to an embodiment of the present invention, and FIG. FIG. 2 is a graph showing the dependence of the carrier-to-noise ratio (C/N) on the alternating current of the magnetic head coil in the embodiment and the conventional example. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Soft magnetic film, 3... Perpendicular magnetization film, 4... Lens, 5... Magnetic head, 6... Coil, 7... Magnetic flux.

Claims (1)

【特許請求の範囲】 1、磁界変調方式で記録を行う光磁気記録媒体において
、基板、透明軟磁性膜、垂直磁化膜さらに保護膜を上記
の順に積層してなることを特徴とする光磁気記録媒体。 2、上記透明軟磁性膜を、非晶質酸化物系面内磁化膜と
したことを特徴とする特許請求の範囲第1項記載の光磁
気記録媒体。
[Claims] 1. A magneto-optical recording medium that performs recording using a magnetic field modulation method, characterized in that a substrate, a transparent soft magnetic film, a perpendicular magnetization film, and a protective film are laminated in the above order. Medium. 2. The magneto-optical recording medium according to claim 1, wherein the transparent soft magnetic film is an amorphous oxide-based in-plane magnetization film.
JP32712587A 1987-12-25 1987-12-25 Magneto-optical recording medium Pending JPH01171137A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32712587A JPH01171137A (en) 1987-12-25 1987-12-25 Magneto-optical recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32712587A JPH01171137A (en) 1987-12-25 1987-12-25 Magneto-optical recording medium

Publications (1)

Publication Number Publication Date
JPH01171137A true JPH01171137A (en) 1989-07-06

Family

ID=18195588

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32712587A Pending JPH01171137A (en) 1987-12-25 1987-12-25 Magneto-optical recording medium

Country Status (1)

Country Link
JP (1) JPH01171137A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0453046A (en) * 1990-06-20 1992-02-20 Sharp Corp Magneto-optical recording medium
US5325344A (en) * 1990-06-13 1994-06-28 Sharp Kabushiki Kaisha Magneto-optical recording and reproducing device having integrally formed recording and reproducing magnetic heads

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5325344A (en) * 1990-06-13 1994-06-28 Sharp Kabushiki Kaisha Magneto-optical recording and reproducing device having integrally formed recording and reproducing magnetic heads
EP0827143A2 (en) * 1990-06-13 1998-03-04 Sharp Kabushiki Kaisha Magneto-optical recording/reproducing device
EP0827143A3 (en) * 1990-06-13 2000-01-19 Sharp Kabushiki Kaisha Magneto-optical recording/reproducing device
JPH0453046A (en) * 1990-06-20 1992-02-20 Sharp Corp Magneto-optical recording medium

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