JPH02161641A - Magneto-optical recording system - Google Patents
Magneto-optical recording systemInfo
- Publication number
- JPH02161641A JPH02161641A JP31390888A JP31390888A JPH02161641A JP H02161641 A JPH02161641 A JP H02161641A JP 31390888 A JP31390888 A JP 31390888A JP 31390888 A JP31390888 A JP 31390888A JP H02161641 A JPH02161641 A JP H02161641A
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- optical recording
- optical
- recording medium
- magnetic
- 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
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 43
- 230000005415 magnetization Effects 0.000 claims description 16
- 239000000758 substrate Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 230000005381 magnetic domain Effects 0.000 claims description 8
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 8
- 150000002910 rare earth metals Chemical class 0.000 claims description 8
- 229910052723 transition metal Inorganic materials 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 150000003624 transition metals Chemical class 0.000 claims description 5
- 229910000808 amorphous metal alloy Inorganic materials 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 description 9
- 239000004417 polycarbonate Substances 0.000 description 6
- 229920000515 polycarbonate Polymers 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 229910017061 Fe Co Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 229910020707 Co—Pt Inorganic materials 0.000 description 1
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- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
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- 229910052735 hafnium Inorganic materials 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
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- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
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- 229910052726 zirconium Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は光磁気記録に係り、とくに、情報のオーバライ
ド（重ね書き）が可能な光磁気記録方式［従来の技術］
垂直磁気異方性を有する磁性膜を記録膜として用いる光
磁気記録媒体では、磁性膜の磁化の向きを情報の“１″
、“０″に対応させるために、記録のみならず消去・再
記録が可能である。この光磁気記録媒体を更に高性能化
する目的で、オーバライドの種々の方式が検討されてい
る。それらの中で、２つのレーザを用いて２つのレーザ
（２レーザ・２ビームと呼ぶ）を光磁気記録媒体に照射
することによりオーバライドを行なう光磁気記録方式は
、オーバライド動作が極めて確実であるため、最も有望
視されている。このような光磁気記録方式としては、例
えば特開昭６０−７６３５号。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to magneto-optical recording, and in particular, to a magneto-optical recording system that allows information to be overridden (overwritten) [Prior art] Perpendicular magnetic anisotropy In a magneto-optical recording medium that uses a magnetic film as a recording film, the direction of magnetization of the magnetic film is set to "1" of information.
, "0", it is possible not only to record but also to erase and re-record. In order to further improve the performance of this magneto-optical recording medium, various override systems are being studied. Among them, the magneto-optical recording method uses two lasers to perform override by irradiating the magneto-optical recording medium with two lasers (referred to as 2 lasers and 2 beams), because the override operation is extremely reliable. , is considered the most promising. An example of such a magneto-optical recording method is JP-A-60-7635.
特開昭６１−２１４２５２号、特開昭５９−１．１７７
０３号各公報にその旨の記載がある。JP-A-61-214252, JP-A-59-1.177
There is a statement to that effect in each publication No. 03.
［発明が解決しようとする課題］
上記従来技術は、レーザ光を導き光磁気媒体にレーザ光
を照射する光ヘッドと、光磁気記録媒体の磁性膜の磁化
反転を補助する磁石との配置についての配慮がなされて
おらず、光磁気記録媒体の駆動装置が大型化したり複雑
化するという問題があった。[Problems to be Solved by the Invention] The above-mentioned prior art is concerned with the arrangement of an optical head that guides a laser beam and irradiates the magneto-optical medium with the laser beam, and a magnet that assists in reversing the magnetization of the magnetic film of the magneto-optical recording medium. This problem has not been taken into consideration, and the problem has been that the drive device for the magneto-optical recording medium has become larger and more complex.
本発明の目的は、光磁気記録装置の大型化や複雑化を引
き起こすことなく、２レーザ・２ビームを用いるオーバ
ライド方式を提唱することにある。An object of the present invention is to propose an override method using two lasers and two beams without making the magneto-optical recording device larger or more complicated.
［問題点を解決するための手段］
上記目的を達成するために本発明では、透明な基板と、
基板上に設けられた少なくとも磁性膜を含む積層膜から
なる光磁気記録媒体と、光磁気記録媒体上にレーザ光を
照射するための光学手段とを用い、レーザ光の強度を変
調することにより光磁気記録媒体の磁性膜に情報を記録
する光磁気記録方式において、先行する第１のビームを
与える光ヘッドには磁界発生機構が該光ヘッドと同一の
側に搭載されており、該光ヘッドにより情報を消去し、
後続する第２のビームを与える光ヘッドによって外部か
ら磁界を印加することなく情報を記録し、しかも先行す
る第１のビームを与える光ヘッドと、後続する第２のビ
ームを与える光ヘッドとを、光磁気記録媒体に対して同
一の側に配置４５させた。[Means for solving the problems] In order to achieve the above object, the present invention includes a transparent substrate,
A magneto-optical recording medium consisting of a laminated film including at least a magnetic film provided on a substrate and an optical means for irradiating laser light onto the magneto-optical recording medium are used to generate light by modulating the intensity of the laser light. In the magneto-optical recording method that records information on the magnetic film of a magnetic recording medium, the optical head that provides the first leading beam is equipped with a magnetic field generation mechanism on the same side as the optical head. Erase information,
Information is recorded without applying an external magnetic field by an optical head that provides a subsequent second beam, and an optical head that provides a preceding first beam and an optical head that provides a subsequent second beam, They were arranged 45 on the same side with respect to the magneto-optical recording medium.
ここで透明な基板としては、ガラス、ポリカーボネート
（ＰＣ）、ポリメチルメタクリレート（ＰＭＭＡ）、変
性ポリカーボネート、紫外線硬化樹脂などが用いられる
。Here, as the transparent substrate, glass, polycarbonate (PC), polymethyl methacrylate (PMMA), modified polycarbonate, ultraviolet curing resin, etc. are used.
磁性膜としては、希土類と遷移金属との非晶質合金を用
いる。ここに希土類とはＬａ、Ｃｅ。As the magnetic film, an amorphous alloy of rare earth and transition metal is used. Here, the rare earths are La and Ce.
Ｐｒ、Ｎｄ、Ｐｍ、Ｓｍ、Ｅｕ、Ｇｄ、Ｔｂ。Pr, Nd, Pm, Sm, Eu, Gd, Tb.
Ｄｙ、Ｈｏ、Ｅｒ、Ｔｍ、Ｙｂ、Ｌｕ、Ｈｆの元素であ
り、遷移金属としてはＦｅ、Ｃｏ、Ｎｉ。The elements are Dy, Ho, Er, Tm, Yb, Lu, and Hf, and the transition metals are Fe, Co, and Ni.
Ｓｃ、Ｔｉ、Ｖ、Ｃｒ、Ｍｒ、Ｃｕ、Ｚｎ、Ｇｅ。Sc, Ti, V, Cr, Mr, Cu, Zn, Ge.
Ｙ、Ｚｒ、Ｎｂ、Ｍｏ、Ｒｕ、Ｒｈ、Ｐｄ、Ａｇ。Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag.
Ｉｎ、Ｓｎ、Ｔａ、Ｗ、Ｐｔなどを用いる。そして希土
類と遷移金属との非晶質合金としては、Ｔ ｂ −Ｆ
ｅ −Ｇ ｏ 、 Ｇ ｄ −Ｔ ｂ −Ｆ ｅ 、
Ｔ ｂ −Ｄｙ−Ｃｏ、Ｄｙ−Ｆｅ−Ｃｏ、Ｎｄ−
Ｔｂ −Ｆｅ−Ｃｏ、Ｐｒ−Ｔｂ−Ｆｅ−Ｃｏ、Ｔｂ−
Ｆｅ−Ｃｏ−Ｎｂ、Ｔｂ−Ｆｅ−Ｃｏ−Ｃｒ、Ｇｄ−Ｆ
ｅ−Ｃｏ−Ｐｔなどを用いる。さらにこれらの磁性膜で
は、１０００ ｅ以下の大きさの磁界を消去方向に印加
することにより磁区の形成が開始され、ゼロＯｅ以上の
大きさの磁界を記録方向に印加することにより、磁区形
状がほぼ一定となるような特性を有しめる。具体的には
、磁化が１、５０ ｅａ＋ｕ ／ ａｍ’以下であるか
、希土類濃度が１７〜３０ａｔ、％の範囲にあるような
磁性膜を用いる。In, Sn, Ta, W, Pt, etc. are used. And as an amorphous alloy of rare earth and transition metal, T b −F
e −G o , G d −T b −F e ,
T b -Dy-Co, Dy-Fe-Co, Nd-
Tb-Fe-Co, Pr-Tb-Fe-Co, Tb-
Fe-Co-Nb, Tb-Fe-Co-Cr, Gd-F
e-Co-Pt or the like is used. Furthermore, in these magnetic films, the formation of magnetic domains is initiated by applying a magnetic field with a magnitude of 1000 e or less in the erasing direction, and the magnetic domain shape is changed by applying a magnetic field with a magnitude of 0 Oe or more in the recording direction. It has characteristics that are almost constant. Specifically, a magnetic film having a magnetization of 1.50 ea+u/am' or less or a rare earth concentration in the range of 17 to 30 at.% is used.
光ヘッドは半導体レーザ、コリメートレンズ。The optical head is a semiconductor laser and a collimating lens.
絞り込みレンズ、アクチュエータなどから構成される。It consists of a diaphragm lens, actuator, etc.
半導体レーザは発光源が１つであってもよいし、複数個
がアレイ状に配列されていてもよい。The semiconductor laser may have one light emitting source, or a plurality of semiconductor lasers may be arranged in an array.
先行する第１のビームが形成するスポットの径と、後続
する第２のビームが形成するスポットの径とは同じであ
るか、前者を後者よりも大きくする。The diameter of the spot formed by the preceding first beam and the diameter of the spot formed by the subsequent second beam are either the same, or the former is made larger than the latter.
スポットの径が異なるようにするには、先行する第１の
ビームの波長を、後続する第２のビームの波長よりも長
くする。あるいは、先行する第１のビームを与える光ヘ
ッドに搭載された絞り込みレンズの開口数を、後続する
第２のビームを与える光ヘッドに搭載された絞り込みレ
ンズの開口数よりも小さくする。To make the spots have different diameters, the wavelength of the preceding first beam is longer than the wavelength of the following second beam. Alternatively, the numerical aperture of the diaphragm lens mounted on the optical head that provides the preceding first beam is made smaller than the numerical aperture of the diaphragm lens mounted on the optical head that provides the subsequent second beam.
磁界発生機構としては、永久磁石、電磁コイルなどを用
いる。該磁界発生機構は、先行する第１のビームを与え
る光ヘッドの絞り込みレンズを取り囲むように配置する
か、絞り込みレンズの近傍に配置するかして、前記光ヘ
ッドと同一の側に搭載する。A permanent magnet, an electromagnetic coil, etc. are used as the magnetic field generation mechanism. The magnetic field generating mechanism is mounted on the same side as the optical head, either by surrounding the diaphragm lens of the optical head that provides the preceding first beam, or by placing it near the diaphragm lens.
［作用］
先行する第１のビームは情報の記録時には強度の高いレ
ーザ光として媒体に照射され磁性膜の保す
磁Ｗ登低減する。このとき先行する第１のビーム照射用
の光ヘッドに取り付けられている磁界発生機構から一定
強度の磁界が印加され、磁化の向きは未記録時の磁化の
向きと同じ方向になる。すなわち情報が一度消去される
。このあと後続する第２のビームにより強度の高いレー
ザ光を照射することにより、未記録時とは異なった方向
に媒体の磁化を向けることができる。ここで重要なこと
は、記録媒体の磁性膜は、外部磁界の補助なしに磁区が
形成可能な点である。既に知られているように、希土類
−遷移金属非晶質膜では温度上昇とともに磁化が単純に
は低下せず、反磁界はキュリー温度近くまで大きい。こ
のため外部からの反転磁界の助けがなくとも磁区を形成
することが可能である。[Operation] When recording information, the preceding first beam is irradiated onto the medium as a high-intensity laser beam to reduce the magnetic W held by the magnetic film. At this time, a magnetic field of a constant strength is applied from a magnetic field generating mechanism attached to the preceding first beam irradiation optical head, and the direction of magnetization becomes the same as the direction of magnetization when not recording. In other words, the information is once erased. By subsequently irradiating the medium with a high-intensity laser beam using a subsequent second beam, it is possible to direct the magnetization of the medium in a direction different from that in the unrecorded state. What is important here is that the magnetic film of the recording medium can form magnetic domains without the aid of an external magnetic field. As is already known, in rare earth-transition metal amorphous films, the magnetization does not simply decrease as the temperature rises, and the demagnetizing field is large close to the Curie temperature. Therefore, it is possible to form magnetic domains without the aid of an external reversal magnetic field.
［実施例コ 以下本発明の実施例を図面を用いて説明する。[Example code] Embodiments of the present invention will be described below with reference to the drawings.
実施例１゜
第１図は本発明になる実施例である。ポリカーボネート
基板１には１−０６μｍのピッチでグループが形成され
ている。該ポリカーボネート基板１をまず真空中で加熱
し、基板中に含まれる水の脱水処理を行なった。この後
、前記ポリカーボネート基板１を高岡波マグネトロンス
パッタ装置内に装てんし、Ｓｊ、Ｎ膜２ ｔ Ｔ ｂ
ｚ １ Ｆ ｅ ｓ ３Ｇ Ｏ＞ ｏ磁性膜３．ＳｉＮ
膜４．Ａｆｌ−Ｔｉ合金金属膜５の順に真空中で連続し
て積層した。このあとポリカーボネート基板１をスパッ
タ装置から取り出し、スピンナにより紫外線硬化樹脂６
を１５μｍの厚さ塗布し、その後紫外線を照射して樹脂
を硬化させた。このようにして作製した二枚の光磁気記
録媒体８を、エポキシ系の接着剤７を用い、ホットメル
ト法により接着し一枚の両面密ｍ構造の光磁気記録媒体
９とした。Embodiment 1 FIG. 1 shows an embodiment of the present invention. Groups are formed on the polycarbonate substrate 1 at a pitch of 1-06 μm. The polycarbonate substrate 1 was first heated in a vacuum to dehydrate the water contained in the substrate. After that, the polycarbonate substrate 1 is loaded into a Takaoka wave magnetron sputtering apparatus, and the Sj, N film 2 t T b
z 1 Fe s 3G O> o Magnetic film 3. SiN
Membrane 4. The Afl-Ti alloy metal films 5 were successively laminated in vacuum in this order. After that, the polycarbonate substrate 1 is taken out from the sputtering device, and the ultraviolet curing resin 6 is coated with a spinner.
was applied to a thickness of 15 μm, and then UV rays were irradiated to cure the resin. The two magneto-optical recording media 8 thus produced were bonded together by a hot-melt method using an epoxy adhesive 7 to form a single magneto-optical recording medium 9 with a double-sided dense m structure.
先行する第１のビーム１０を与える光ヘッド１−１にお
いて、半導体レーザ１２から出射されたレーザ光はコリ
メートレンズ１３によって平行光となり、絞り込みレン
ズ１４によって光磁気記録媒体９に照射される。ここで
絞り込みレンズ１４の周囲にはＳｍ−Ｃｏ系永久磁石よ
り成る磁界発生機構１５を配置し、光磁気記録媒体に対
して静磁界を印加する。このときの磁界の向きは未記録
状態（初期状Ｓ）での光磁気記録媒体９の磁性膜３の磁
化方向と同じであり、先行する第１のビーム１０が照射
されていないときには磁性膜３の磁化方向を乱すことは
ない。レーザ１２により先行６″る第１のビー・・ム１
０が」分な強度で照射されると磁性膜：３の保磁力より
も永久磁石より成る磁界発生機構１５からの静磁界の方
が大きくなり、磁性膜３の磁化は全て静磁界方向に整う
。つまり記録されていた情報は消去される。In the optical head 1 - 1 that provides the first preceding beam 10 , the laser light emitted from the semiconductor laser 12 is turned into parallel light by the collimating lens 13 and irradiated onto the magneto-optical recording medium 9 by the focusing lens 14 . A magnetic field generating mechanism 15 made of an Sm--Co permanent magnet is arranged around the aperture lens 14 to apply a static magnetic field to the magneto-optical recording medium. The direction of the magnetic field at this time is the same as the magnetization direction of the magnetic film 3 of the magneto-optical recording medium 9 in the unrecorded state (initial state S), and when the preceding first beam 10 is not irradiated, the magnetic film 3 does not disturb the direction of magnetization. The first beam 1 is preceded by 6" by the laser 12.
When irradiated with an intensity equal to 0, the static magnetic field from the magnetic field generation mechanism 15 made of a permanent magnet becomes larger than the coercive force of the magnetic film 3, and the magnetization of the magnetic film 3 is all aligned in the direction of the static magnetic field. . In other words, the recorded information will be erased.
後続する第２のビー１ａ １６をり−える光ヘッド】７
は半導体レーザ］、８．コリメートレンズ］、３Ｉ絞り
込みレンズ１４により構成される。記録すべき情報信号
のＩｔ 、Ｉ Ｉｔ 、 １１ Ｑ Ｈに応じて半導
体レーザはＯＮ、ＯＦＦを繰り返し、ｔａ磁性膜に上向
きあるいは下向きの磁化を記録する。記録された情報を
再生する際には半導体１ノーザ］、８から弱い強度のレ
ーザ光を出射し、反射光を偏光ビームスプリッタ１９．
ハーフプリズム２０へと導き２組の検光子２１．検出器
２２により差動検出する。当然ながら、情報再生時には
半導体レーザ１２からはレーザ光は出射されていない。Optical head that can change the following second beam 1a 16】7
is a semiconductor laser], 8. collimating lens] and a 3I diaphragm lens 14. The semiconductor laser is repeatedly turned on and off in accordance with the information signals It, I It, and 11 Q H to be recorded, thereby recording upward or downward magnetization on the ta magnetic film. When reproducing the recorded information, a low-intensity laser beam is emitted from the semiconductor 1 noser], 8, and the reflected light is sent to the polarizing beam splitter 19.
Two sets of analyzers 21. are guided to the half prism 20. The detector 22 performs differential detection. Naturally, no laser light is emitted from the semiconductor laser 12 during information reproduction.
本実施例においては同一波長（８２０ｎｍ）の半導体レ
ーザ１２゜１８と、同一開口数（０，５５）の絞り込み
レンズ１４を用いた。さらに、先行する第１のビームを
集光する絞り込みｌノノズ１４の開口数を０．５５．後
続する第２のビ・−ムを集光する絞り込み！ノノズ１４
の開口数を０．６とした２つの光ヘッドＪ、ｉ、、１７
を試作したところ、先行する第１のビームによる消去が
広い幅にわたって行なわれるため、光ヘッド１７のトラ
ッキングずれがあった場合でも、光ヘッド１１によって
充分な消去が確保できた。In this embodiment, semiconductor lasers 12.degree. 18 having the same wavelength (820 nm) and diaphragm lenses 14 having the same numerical aperture (0.55) were used. Furthermore, the numerical aperture of the aperture nozzle 14 that condenses the leading first beam is set to 0.55. Aperture to focus the following second beam! Nonozu 14
Two optical heads J,i,,17 with a numerical aperture of 0.6.
When a prototype was manufactured, the erasing by the preceding first beam was performed over a wide width, so even if there was a tracking deviation of the optical head 17, sufficient erasing could be ensured by the optical head 11.
実施例２゜ 第２図は本発明になる他の実施例である。Example 2゜ FIG. 2 shows another embodiment of the present invention.
Ｇｄ□Ｆ ｅ、、Ｃｏ、磁性膜を有する両面密着構造の
光磁気記録媒体２７を用いた。レーザアレイ２３には波
長７８０ｎｍと８３０ｎｍの２個のレーザダイオードが
搭載されている。レーザアレイ２３から出射されたレー
ザ光はコリツー１−レンズ１３により平行光となり、波
長選択型ビームスプリッタにより、７８０ｎ＋＊のレー
ザ光は透過し、８３０ｎｍのレーザ光は反射する。反射
したレーザ光はミラー２５により折り曲げられ絞り込み
１ノンズ１４により光磁気記録媒体２７に照射される。A magneto-optical recording medium 27 having a double-sided adhesive structure having a Gd□Fe, Co, magnetic film was used. The laser array 23 is equipped with two laser diodes with wavelengths of 780 nm and 830 nm. The laser beam emitted from the laser array 23 is turned into parallel light by the Coritsu 1-lens 13, and by the wavelength selective beam splitter, the 780n+* laser beam is transmitted and the 830nm laser beam is reflected. The reflected laser beam is bent by the mirror 25 and irradiated onto the magneto-optical recording medium 27 by the aperture lens 14 .
一方７８０ｎｍの波長のレーザ光も絞り込みレンズ１，
４によって光磁気記録媒体２７に照射される。したがっ
て先行する第ｊ−のビーム１０は波長が８３０ｎｍであ
り、後続する第２のビーム】、６の波長は７８０ｎｍで
ある。この場合には、先行する第１．のビーム１０が光
磁気記録媒体２７上で作るスポットの径の方が、後続す
る第２のビーム１６が作るスポットの径よりも大きいた
め消去幅が充分とれ、消え残りが少なくなるという効果
がある。On the other hand, the laser beam with a wavelength of 780 nm is also focused by the focusing lens 1.
4, the magneto-optical recording medium 27 is irradiated with light. Therefore, the preceding j-th beam 10 has a wavelength of 830 nm, and the following second beam 10 has a wavelength of 780 nm. In this case, the preceding first. Since the diameter of the spot created by the second beam 10 on the magneto-optical recording medium 27 is larger than the diameter of the spot created by the subsequent second beam 16, there is an effect that a sufficient erasing width is obtained and there is less unerased material. .
なお２つの光ビーム１．０．１６は同一のトラック上に
あっても、別々のトラック」二にあってもよく、どちら
の場合であっても本発明の効果を損なうものではない。Note that the two light beams 1.0.16 may be on the same track or on separate tracks, and in either case, the effects of the present invention are not impaired.
実施例３、
第３図は本発明になる実施例で用いる光磁気記録媒体の
模式図である。アクリル基板２８上に、ＡＱＮ膜２９
、 Ｔ ｂ、、Ｆ ｅ、、Ｇ ｏ、１Ｎ ｂ３磁性膜３
０、ＡＱＮ膜３膜製１成し光磁気記録媒体３２を得た。Example 3 FIG. 3 is a schematic diagram of a magneto-optical recording medium used in an example of the present invention. An AQN film 29 is formed on the acrylic substrate 28.
, T b, , Fe, , Go, 1N b3 Magnetic film 3
A magneto-optical recording medium 32 made of three AQN films was obtained.
このとき磁性膜３０の磁化は室温で９０ｅｍｕ／Ｃｍ’
であった。この光磁気記録媒体３２を２４００ｒｐｍで
回転させ、レーザ光強度を１． ＯｍＷとして、ＩＭＨ
ｚの周波数（キャリア）を記録し再生したときのキャリ
アＣどノイズＮの印加磁界に対する出力を測定した結果
を第４図に示す。At this time, the magnetization of the magnetic film 30 is 90 emu/Cm' at room temperature.
Met. This magneto-optical recording medium 32 is rotated at 2400 rpm, and the laser beam intensity is set to 1. As OmW, IMH
FIG. 4 shows the results of measuring the output of carrier C and noise N with respect to the applied magnetic field when the frequency (carrier) of z was recorded and reproduced.
１０００ ｅ以下Φ大きさの磁界が消去方向（負方向）
に印加されるとＣが立ち上がり、磁区の形成が開始され
る。ゼロＯｅ以上の大きさの磁界が記録方向（正方向）
に印加されるとＣは飽和し、磁区形状が一定となる。し
たがってゼロ磁界においてＣ／Ｎは４５ｄＢになる。A magnetic field with a Φ size of 1000 e or less is in the erasing direction (negative direction)
When C is applied, C rises and the formation of magnetic domains begins. A magnetic field of magnitude greater than zero Oe is in the recording direction (positive direction)
When applied to C, C becomes saturated and the magnetic domain shape becomes constant. Therefore, the C/N is 45 dB at zero magnetic field.
第１表は、種々の磁性膜に対する室温での磁化と、ゼロ
磁界におけるＣ／Ｎの値である。 Ｃ／Ｎの評価は上述
の条件のもとで行なった、これらの結果より、磁化は１
５０ｅｍｕ／ａｍ’以下の場合、あるいは、希土類濃度
が１５〜３Ｑａｔ、％の範囲にあれば、良好なＣ／Ｎが
得られることが分かる。Table 1 shows the magnetization at room temperature and the C/N value at zero magnetic field for various magnetic films. The C/N was evaluated under the above conditions. From these results, the magnetization is 1.
It can be seen that a good C/N can be obtained when it is 50 emu/am' or less, or when the rare earth concentration is in the range of 15 to 3 Qat, %.
第 １ 表
以上説明した通り、実施例３で示された特性の光磁気記
録媒体を用いると、先行する第］、のビームを与える光
ヘッドには磁界発生機構がヘッドと同一の側に搭載され
ており、光ヘッドにより情報を消去し、後続する第２の
ビームを与える光ヘッドによって外部から磁界を印加す
ることなく情報を記録することができる。また、この場
合、先行する第１のビームを与える光ヘッドを後続する
第２のビームを与える光ヘッドとは光磁気記録媒体に対
して同一の側に配置することができる。Table 1 As explained above, when a magneto-optical recording medium having the characteristics shown in Example 3 is used, the optical head that provides the preceding beam has a magnetic field generation mechanism mounted on the same side as the head. The optical head erases information, and the subsequent optical head that applies the second beam allows information to be recorded without applying an external magnetic field. Furthermore, in this case, the optical head that provides the preceding first beam and the optical head that provides the subsequent second beam can be placed on the same side with respect to the magneto-optical recording medium.
［発明の効果］
本発明によれば、光ヘッドや磁界発生機構を全て光磁気
記録媒体の片側に配置しであるため、光磁気記録媒体の
駆動装置の厚さ（高さ）が薄＜（、。[Effects of the Invention] According to the present invention, since the optical head and the magnetic field generation mechanism are all arranged on one side of the magneto-optical recording medium, the thickness (height) of the drive device for the magneto-optical recording medium is thin. ,.
でよいという長所があり、いわゆるハーフハイドのサイ
ズに納めることが容易である。さらに、第２のビームを
与える光ヘッドには磁界発生機構がないため、駆動装置
が単純な構成となる。It has the advantage of being able to fit into the so-called half-hide size. Furthermore, since the optical head that provides the second beam does not have a magnetic field generation mechanism, the drive device has a simple configuration.
第１図、第２図は本発明になる光磁気記録方式の説明図
、第３図は本発明で用いる光磁気記録媒体の模式図、第
４図は本発明で用いる光磁気記録媒体の特性を示す図で
ある。
１．２８・・・基板、３，３０・・・磁性膜、８，９゜
２７．３２・・・光磁気記録媒体、１ｏ・・・先行する
第１のビーム、１１・・・先行する第１のビーｚｚ ］
、 Ｏを与える光ヘッド、１５．２６・・・磁界発生機
構、１６・・・後続する第２のビーム、１７・・・後続
する第２のビーム１６を与える光ヘッド、３３・・・キ
ャリア出力、３４・・・ノイズ出力。
第７目Figures 1 and 2 are explanatory diagrams of the magneto-optical recording system according to the present invention, Figure 3 is a schematic diagram of the magneto-optical recording medium used in the present invention, and Figure 4 is the characteristics of the magneto-optical recording medium used in the present invention. FIG. 1.28...Substrate, 3,30...Magnetic film, 8,9°27.32...Magneto-optical recording medium, 1o...Preceding first beam, 11...Preceding first beam 1 Beezz]
, 15.26...Magnetic field generation mechanism, 16...Second beam that follows, 17...Optical head that provides second beam 16 that follows, 33...Carrier output , 34... Noise output. 7th eye
Claims (1)
膜を含む積層膜からなる光磁気記録媒体と、該光磁気記
録媒体上にレーザ光を照射するための光学手段とを用い
、レーザ光の強度を変調することにより該光磁気記録媒
体の磁性膜に情報を記録する光磁気記録方式において、
先行する第１のビームを与える光ヘッドには磁界発生機
構が該光ヘッドと同一の側に搭載されており、該光ヘッ
ドにより情報を消去し、後続する第２のビームを与える
光ヘッドによって外部から磁界を印加することなく情報
を記録し、しかも該先行する第１のビームを与える光ヘ
ッドと該後続する第２のビームを与える光ヘッドとが上
記光磁気記録媒体に対して同一の側にあることを特徴と
する光磁気記録方式。 ２、磁性膜が希土類と遷移金属との非晶質合金からなる
ことを特徴とする請求項１記載の光磁気記録方式。 ３、磁性膜の室温での磁化が１５０ｅｍｕ／ｃｍ＾３以
下であることを特徴とする請求項１または請求項２記載
の光磁気記録方式。 ４、希土類濃度が１７〜３０ａｔ．％の範囲にあること
を特徴とする請求項２または３記載の光磁気記録方式。 ５、先行する第１のビームが形成するスポットの径が、
後続する第２のビームが形成するスポットの径よりも大
きいことを特徴とする請求項１または２記載の光磁気記
録方式。 ６、先行する第１のビームの波長の方が、後続する第２
のビームの波長よりも長いことを特徴とする請求項５記
載の光磁気記録方式。 ７、先行する第１のビームを与える光ヘッドに搭載され
た絞り込みレンズの開口数が、後続する第２のビームを
与える光ヘッドに搭載された絞り込みレンズの開口数よ
りも小さいことを特徴とする請求項５または６記載の光
磁気記録方式。 ８、透明な基板と、該基板上に設けられ少なくとも磁性
膜を含む積層膜からなる光磁気記録媒体と、該光磁気記
録媒体上にレーザ光を照射するための光学手段とを用い
、レーザ光の強度を変調することにより該光磁気記録媒
体の磁性膜に情報を記録する光磁気記録方式において、 １００Ｏｅ以下の大きさの磁界を消去方向に印加するこ
とにより磁区の形成が開始され、０Ｏｅ以上の大きさの
磁界を記録方向に印加することにより磁区形状がほぼ一
定となるような光磁気記録媒体を用いたことを特徴とす
る光磁気記録方式。 ９、磁性膜が希土類と遷移金属との非晶質合金からなる
ことを特徴とする請求項８記載の光磁気記録方式。 １０、磁性膜の室温での磁化が１５０ｅｍｕ／ｃｍ＾３
以下であることを特徴とする請求項８記載の光磁気記録
方式。 １１、希土類濃度が１７〜３０ａｔ．％の範囲にあるこ
とを特徴とする請求項８記載の光磁気記録方式。[Claims] 1. A magneto-optical recording medium comprising a transparent substrate, a laminated film provided on the substrate and including at least a magnetic film, and an optical means for irradiating the magneto-optical recording medium with laser light. In a magneto-optical recording method in which information is recorded on the magnetic film of the magneto-optical recording medium by modulating the intensity of laser light using
A magnetic field generating mechanism is mounted on the same side of the optical head that provides the first leading beam, and the optical head erases information, and the optical head that provides the subsequent second beam erases information from the outside. information is recorded without applying a magnetic field from above, and the optical head that provides the preceding first beam and the optical head that provides the subsequent second beam are on the same side with respect to the magneto-optical recording medium. A magneto-optical recording system characterized by: 2. The magneto-optical recording system according to claim 1, wherein the magnetic film is made of an amorphous alloy of rare earth and transition metals. 3. The magneto-optical recording method according to claim 1 or 2, wherein the magnetization of the magnetic film at room temperature is 150 emu/cm^3 or less. 4. Rare earth concentration is 17 to 30 at. 4. The magneto-optical recording system according to claim 2, wherein the magneto-optical recording method is within a range of %. 5. The diameter of the spot formed by the preceding first beam is
3. The magneto-optical recording system according to claim 1, wherein the diameter of the spot formed by the subsequent second beam is larger than the diameter of the spot. 6. The wavelength of the preceding first beam is higher than that of the following second beam.
6. The magneto-optical recording system according to claim 5, wherein the wavelength of the beam is longer than that of the beam. 7. The numerical aperture of the diaphragm lens mounted on the optical head that provides the leading first beam is smaller than the numerical aperture of the diaphragm lens mounted on the optical head that provides the subsequent second beam. The magneto-optical recording system according to claim 5 or 6. 8. Using a transparent substrate, a magneto-optical recording medium consisting of a laminated film provided on the substrate and including at least a magnetic film, and an optical means for irradiating laser light onto the magneto-optical recording medium, In the magneto-optical recording method that records information on the magnetic film of the magneto-optical recording medium by modulating the intensity of the magneto-optical recording medium, the formation of magnetic domains is started by applying a magnetic field of 100 Oe or less in the erasing direction, and A magneto-optical recording method characterized by using a magneto-optical recording medium in which the shape of the magnetic domain becomes approximately constant by applying a magnetic field of magnitude in the recording direction. 9. The magneto-optical recording system according to claim 8, wherein the magnetic film is made of an amorphous alloy of rare earth and transition metals. 10. The magnetization of the magnetic film at room temperature is 150 emu/cm^3
9. The magneto-optical recording system according to claim 8, characterized in that: 11. Rare earth concentration is 17 to 30 at. 9. The magneto-optical recording system according to claim 8, wherein the magneto-optical recording method is within a range of %.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31390888A JPH02161641A (en) | 1988-12-14 | 1988-12-14 | Magneto-optical recording system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31390888A JPH02161641A (en) | 1988-12-14 | 1988-12-14 | Magneto-optical recording system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02161641A true JPH02161641A (en) | 1990-06-21 |
Family
ID=18046967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31390888A Pending JPH02161641A (en) | 1988-12-14 | 1988-12-14 | Magneto-optical recording system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02161641A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022000937A1 (en) * | 2020-07-03 | 2022-01-06 | 暨南大学 | Dual-pulse excitation method for ultrafast and super-resolution all-optical magnetic recording |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6374146A (en) * | 1986-09-18 | 1988-04-04 | Fujitsu Ltd | Recording method of magneto-optical disk |
| JPS63244347A (en) * | 1987-03-30 | 1988-10-11 | Ricoh Co Ltd | Magneto-optical recording method |
-
1988
- 1988-12-14 JP JP31390888A patent/JPH02161641A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6374146A (en) * | 1986-09-18 | 1988-04-04 | Fujitsu Ltd | Recording method of magneto-optical disk |
| JPS63244347A (en) * | 1987-03-30 | 1988-10-11 | Ricoh Co Ltd | Magneto-optical recording method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022000937A1 (en) * | 2020-07-03 | 2022-01-06 | 暨南大学 | Dual-pulse excitation method for ultrafast and super-resolution all-optical magnetic recording |
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