JPH0213361B2 - - Google Patents
Info
- Publication number
- JPH0213361B2 JPH0213361B2 JP56207846A JP20784681A JPH0213361B2 JP H0213361 B2 JPH0213361 B2 JP H0213361B2 JP 56207846 A JP56207846 A JP 56207846A JP 20784681 A JP20784681 A JP 20784681A JP H0213361 B2 JPH0213361 B2 JP H0213361B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic recording
- film
- recording medium
- optical
- 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 - Lifetime
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
- G11B11/10532—Heads
- G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
- G11B11/10539—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording using electromagnetic beams, e.g. polarised light
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】 (a) 発明の技術分野 本発明は光学磁気記録方法に関する。[Detailed description of the invention] (a) Technical field of the invention The present invention relates to an optical magnetic recording method.
(b) 技術の背景
磁気記録方法に於て、記録密度の向上を図る一
手段として垂直方向の一軸磁気異方性を有する磁
気記録媒体を用いて行う垂直磁気記録方式があ
る。通常の垂直磁気記録方式に於ては磁気ヘツド
を用い、それ漏れ磁束により情報の記録がなされ
るので、記録密度は２〜３〔μｍ／ビツト〕程度
が限度である。そこで更に記録密度を向上させ記
録容量を増大せしめる手段として、書き込み面積
をしぼることが可能な光を用いて、垂直磁気記録
媒体に情報の書き込みを行う光学磁気記録方法が
提供されている。(b) Background of the Technology Among magnetic recording methods, there is a perpendicular magnetic recording method that uses a magnetic recording medium having uniaxial magnetic anisotropy in the perpendicular direction as a means of improving recording density. In the normal perpendicular magnetic recording system, a magnetic head is used and information is recorded by leakage magnetic flux, so that the recording density is limited to about 2 to 3 .mu.m/bit. Therefore, as a means to further improve the recording density and increase the recording capacity, an optical magnetic recording method has been proposed in which information is written on a perpendicular magnetic recording medium using light that can reduce the writing area.
(c) 従来技術と問題点
従来提供されている光磁気記録方法は、詳しく
いえば光熱磁気記録方式である。即ちこの方式に
於ては公知のように、垂直方向の一軸磁気異方性
を有する磁気記録媒体を、磁化と反対方向の弱い
磁場内に位置せしめた状態で該記録媒体面に微小
径にしぼつたレーザ等光ビームの照射がなされ、
該光ビーム照射領域の磁気記録媒体温度をキユリ
ー点近くまで昇温させることにより、該昇温領域
の磁化極性を反転せしめて情報の書き込みがなさ
れる。従つて該従来方法に於ては、磁気記録媒体
の昇温に時間を要するために書き込み速度が遅く
なるという問題がある。そこで書き込み速度を早
める手段として磁気記録媒体のキユリー点の温度
を下げる方法もあるが、このようにするとキユリ
ー点の温度が常温に近付くために記録内容の保存
が不完全になるという問題が生じてくる。更に又
従来の方法に於ては、前記のように磁気記録媒体
の周囲に外部磁界を設ける必要があるので、記録
装置が複雑化するといつた問題もあつた。(c) Prior Art and Problems The magneto-optical recording method that has been provided so far is specifically the magneto-optical recording method. That is, in this method, as is well known, a magnetic recording medium having uniaxial magnetic anisotropy in the perpendicular direction is placed in a weak magnetic field in the opposite direction to the magnetization, and a minute diameter is formed on the surface of the recording medium. A light beam such as a laser is irradiated,
By raising the temperature of the magnetic recording medium in the light beam irradiation area to near the Curie point, the magnetization polarity of the temperature raised area is reversed and information is written. Therefore, in this conventional method, there is a problem that the writing speed becomes slow because it takes time to raise the temperature of the magnetic recording medium. One way to speed up the writing speed is to lower the temperature of the Curie point of the magnetic recording medium, but this method causes the problem that the recorded content cannot be saved incompletely because the temperature of the Curie point approaches room temperature. come. Furthermore, in the conventional method, since it is necessary to provide an external magnetic field around the magnetic recording medium as described above, there is a problem in that the recording apparatus becomes complicated.
(d) 発明の目的
本発明は上記問題点を除去することを目的と
し、光ビーム照射により磁気記録媒体中に形成さ
れる磁場を用いて該磁気記録媒体に情報の書き込
みを行う光磁気記録方法を提供することにある。(d) Purpose of the Invention The present invention aims to eliminate the above-mentioned problems, and provides a magneto-optical recording method for writing information on a magnetic recording medium using a magnetic field formed in the magnetic recording medium by irradiation with a light beam. Our goal is to provide the following.
(e) 発明の構成
本発明は光磁気記録方法において、非磁性体基
板上に設けられた垂直磁気記録が可能で且つ導電
性を有する磁気記録媒体に、集束された左回りま
たは右回りの円偏光をあて、該円偏光の回転電場
によつて該磁気記録媒体内に生ずる実電流からな
る回転電流により磁気記録媒体内に垂直方向の磁
場を形成させ、該垂直磁場により情報の記録を行
うことを特徴とする。(e) Structure of the Invention The present invention provides a magneto-optical recording method in which a focused counterclockwise or clockwise circle is applied to a magnetic recording medium that is provided on a non-magnetic substrate and is capable of perpendicular magnetic recording and has electrical conductivity. Applying polarized light, forming a perpendicular magnetic field in the magnetic recording medium by a rotating current consisting of an actual current generated in the magnetic recording medium by a rotating electric field of the circularly polarized light, and recording information using the perpendicular magnetic field. It is characterized by
(f) 発明の実施例
導体膜上の一点に円偏光をレンズで集光して当
てると、該導体膜内に回転電場が形成され、該回
転電場によつて導体膜内に前記回転電場に沿つて
実電流からなる回転電流が発生し、該回転電流に
よつて光照射領域に該導体膜面に対して垂直方向
の磁場が形成される。そして該磁場の向きは円偏
光の回転方向によつて逆転する。(f) Embodiments of the Invention When circularly polarized light is focused and applied to a point on a conductive film using a lens, a rotating electric field is formed within the conductive film, and the rotating electric field causes a change in the rotating electric field within the conductive film. A rotating current consisting of a real current is generated along the conductor, and a magnetic field is formed in the light irradiation region in a direction perpendicular to the surface of the conductor film. The direction of the magnetic field is reversed depending on the rotation direction of the circularly polarized light.
本発明の光磁気記録方法に於ては、上記光磁気
現象を用い、垂直方向の一軸磁気異方性を有する
磁気記録媒体膜に、情報に応じて異なる回転方向
を有する円偏光を当て、該円偏光によつて磁気記
録媒体膜内に形成される上向き或るいは下向きの
磁場によつて情報の記録がなされる。 In the magneto-optical recording method of the present invention, using the above magneto-optical phenomenon, circularly polarized light having different rotational directions depending on information is applied to a magnetic recording medium film having uniaxial magnetic anisotropy in the perpendicular direction. Information is recorded by an upward or downward magnetic field formed in the magnetic recording medium film by circularly polarized light.
以下本発明を実施例について、第１図に示す一
実施例に於ける装置構成図、及び第２図ａ，ｂに
示す磁気記録媒体内に於ける異なる一構造例の断
面模式図を用いて詳細に説明する。 The present invention will be described below with reference to an embodiment of the present invention, using a device configuration diagram in an embodiment shown in FIG. 1 and a cross-sectional schematic diagram of a different structural example in a magnetic recording medium shown in FIGS. Explain in detail.
本発明の方法により光磁気記録を行うに際して
は、例えば第１図に示すように、半導体レーザ装
置或るいはガス・レーザ装置等のレーザ光源１で
発生させたレーザ光２から通常の偏光子３を用い
て特定の直線偏波を取り出し、該直線偏波を有す
るレーザ光２′を電気光学効果或るいは磁気光学
効果を用いた光位相変調器４を通して情報に応じ
て左回り或るいは右回りの円偏光に変え、該円偏
光を有するレーザ光２″を光学レンズ等の集光系
５で１〔μｍφ〕以下の微小なビーム・スポツト
径にしぼる。そして該レーザ・スポツトを、１
〔μｍ〕程度の通常の厚さで媒体基板６上に磁気
記録媒体として形成されている金属磁性膜例えば
コバルト−鉄（Co−Fe）、コバルト−ニツケル
（Co−Ni）、コバルト−クロム（Co−Cr）等の合
金からなる磁性合金膜７に当て、該円偏光レー
ザ・スポツトによつて磁性合金膜７内に生ずる前
記回転電流によつて、レーザ照射領域に形成され
る上向き或るいは下向きの垂直磁場により、該磁
性合金膜７に直接情報の書き込みがなされる。な
お該実施例に於て、磁性合金膜に記録を行う際の
垂直磁場の強さは数10〔Oe〕程度あれば良く、そ
のために必要なレーザ光源１の出力は数〔ｍＷ〕
〜10〔ｍＷ〕程度で充分である。 When performing magneto-optical recording according to the method of the present invention, for example, as shown in FIG. is used to extract a specific linearly polarized wave, and the laser beam 2' having the linearly polarized wave is passed through an optical phase modulator 4 using an electro-optic effect or a magneto-optic effect to rotate counterclockwise or rightward depending on the information. The circularly polarized laser beam 2'' is focused into a minute beam spot diameter of 1 [μmφ] or less using a focusing system 5 such as an optical lens.Then, the laser spot is
A metal magnetic film, such as cobalt-iron (Co-Fe), cobalt-nickel (Co-Ni), cobalt-chromium (Co The circularly polarized laser spot is applied to a magnetic alloy film 7 made of an alloy such as Information is directly written into the magnetic alloy film 7 by the perpendicular magnetic field. In this embodiment, the strength of the perpendicular magnetic field when recording on the magnetic alloy film only needs to be on the order of several tens of Oe, and the output of the laser light source 1 required for this purpose is several [mW].
~10 [mW] is sufficient.
上記実施例に於ては磁気記録媒体として磁性合
金膜からなる金属磁性膜を用いたが、該磁気記録
媒体に絶縁体磁性膜を用いることもできる。但し
この場合は絶縁体磁性膜内には前記円偏光照射に
よる回転電流が生じにくいので、非磁性体金属膜
と垂直方向の一軸磁気異方性を有する絶縁体磁性
膜とを積層して磁気記録媒体膜を形成し、円偏光
照射により非磁性体金属膜内に垂直磁場を形成
し、該垂直磁場の漏れ磁束によつて絶縁体磁性膜
に情膜の記録がなされる。第２図ａ及びｂは上記
非磁性体金属膜と絶縁体磁性膜の組み合わせによ
つて形成された磁気記録媒体の二つの構造例を模
式的に示したもので、図に於て、６は媒体基板、
８は非磁性体金属膜、９は絶縁体磁性膜である。
非磁性金属膜８としては導電性の優れた非磁性体
金属膜例えば銅（Cu）膜等が好ましく、厚さは
500〜1000〔Å〕程度でよい。又絶縁体磁性膜９と
しては垂直方向の一軸磁気異方性を有する希土
類・鉄・ガーネツト等が用いられ、その厚さは
0.5〜１〔μｍ〕程度が適切である。そして第２図
ａ，ｂに示すように、非磁性体金属膜８と絶縁体
磁性膜９の何れを上層に設けてもさしつかえな
い。 In the above embodiments, a metal magnetic film made of a magnetic alloy film was used as the magnetic recording medium, but an insulator magnetic film may also be used for the magnetic recording medium. However, in this case, it is difficult to generate a rotating current in the insulating magnetic film due to the circularly polarized light irradiation, so a non-magnetic metal film and an insulating magnetic film having perpendicular uniaxial magnetic anisotropy are laminated to perform magnetic recording. A medium film is formed, a perpendicular magnetic field is formed in the non-magnetic metal film by irradiation with circularly polarized light, and a magnetic film is recorded on the insulating magnetic film by leakage magnetic flux of the perpendicular magnetic field. Figures 2a and 2b schematically show two structural examples of magnetic recording media formed by the combination of the above-mentioned non-magnetic metal film and insulating magnetic film. media substrate,
8 is a non-magnetic metal film, and 9 is an insulator magnetic film.
The non-magnetic metal film 8 is preferably a non-magnetic metal film with excellent conductivity, such as a copper (Cu) film, and the thickness is
It may be about 500 to 1000 [Å]. The insulator magnetic film 9 is made of rare earth metal, iron, garnet, etc., which has vertical uniaxial magnetic anisotropy, and its thickness is as follows:
Approximately 0.5 to 1 [μm] is appropriate. As shown in FIGS. 2a and 2b, either the non-magnetic metal film 8 or the insulating magnetic film 9 may be provided as the upper layer.
以上本発明を基本的な実施例について説明した
が、磁気記録媒体を設ける非磁性基板に光学ガラ
ス等の透明物質を用いることにより、本発明の方
法を用いて磁気記録媒体に裏面から情報の書き込
みを行うことができる。 The basic embodiments of the present invention have been described above, but by using a transparent material such as optical glass for a non-magnetic substrate on which a magnetic recording medium is provided, information can be written on the magnetic recording medium from the back side using the method of the present invention. It can be performed.
又本発明の方法は、磁性膜を保護するためその
表出面上に二酸化シリコン（SiO2）、二酸化チタ
ン（TiO2）等の透明保護膜を設けた磁気記録媒
体にも適用できる。 The method of the present invention can also be applied to magnetic recording media in which a transparent protective film of silicon dioxide (SiO 2 ), titanium dioxide (TiO 2 ), etc. is provided on the exposed surface of the magnetic film to protect it.
更に又磁気記録媒体として、所定の厚さの二酸
化シリコン（SiO2）膜等からなる光に対する反
射防止膜で覆われた磁性膜を用いることにより、
情報の書き込み効率を更に向上せしめることがで
きる。 Furthermore, by using a magnetic film covered with an anti-reflection film against light made of a silicon dioxide (SiO 2 ) film or the like of a predetermined thickness as a magnetic recording medium,
Information writing efficiency can be further improved.
(g) 発明の効果
以上説明したように本発明の方法に於ては、磁
気記録媒体に円偏光を有する光ビームを当て、該
円偏光光ビーム照射領域に形成された垂直磁場に
より記録密度への情報の書き込みがなされる。従
つて従来の光熱磁気記録のように光照射による温
度上昇によつて書き込みがなされる場合と異り、
光を照射すれば瞬時に書き込みがなされ、情報信
号に対する応答速度が極めて速くなる。又磁気記
録媒体のキユーリ点の温度を下げる必要もないの
で、記録の保存が完全になる。更に又書き込みに
際して外部磁界を必要としないので、装置が簡略
化される。(g) Effects of the Invention As explained above, in the method of the present invention, a magnetic recording medium is irradiated with a circularly polarized light beam, and a perpendicular magnetic field formed in the circularly polarized light beam irradiation area is used to increase the recording density. information is written. Therefore, unlike conventional photothermal magnetic recording, where writing is done by increasing temperature due to light irradiation,
When irradiated with light, writing is instantaneously performed, and the response speed to information signals becomes extremely fast. Furthermore, since there is no need to lower the temperature of the Kyuri point of the magnetic recording medium, the recording can be preserved perfectly. Furthermore, since no external magnetic field is required for writing, the apparatus is simplified.
以上本発明は高速高密度記録及び記録の信頼性
向上に有効である。 As described above, the present invention is effective for high-speed, high-density recording and for improving recording reliability.
第１図は本発明の一実施例に於ける装置構成
図、第２図ａ及びｂは磁気記録媒体に於ける異な
る構造例の断面模式図である。
図に於て、１はレーザ光源、２はレーザ光、
２′は直線偏光を有するレーザ光、２″は円偏光を
有するレーザ光、３は偏光子、４は光位相変調
器、５は集光系、６は媒体基板、７は磁性合金
膜、８は非磁性体金属膜、９は絶縁体磁性膜を示
す。
FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention, and FIGS. 2a and 2b are schematic cross-sectional views of different structural examples of a magnetic recording medium. In the figure, 1 is a laser light source, 2 is a laser beam,
2' is a laser beam with linear polarization, 2'' is a laser beam with circular polarization, 3 is a polarizer, 4 is an optical phase modulator, 5 is a focusing system, 6 is a medium substrate, 7 is a magnetic alloy film, 8 9 indicates a non-magnetic metal film, and 9 indicates an insulator magnetic film.
Claims (1)
可能で且つ導電性を有する磁気記録媒体に、集束
された左回りまたは右回りの円偏光をあて、該円
偏光の回転電場によつて該磁気記録媒体内に生ず
る実電流からなる回転電流により磁気記録媒体内
に垂直方向の磁場を形成させ、該垂直磁場により
情報の記録を行うことを特徴とする光学磁気記録
方法。 ２ 上記磁気記録媒体が金属磁性膜からなること
を特徴とする特許請求の範囲第１項記載の光学磁
気記録方法。 ３ 上記磁気記録媒体が絶縁体磁性膜と非磁性体
金属膜との積層膜からなることを特徴とする特許
請求の範囲第１項記載の光学磁気記録方法。 ４ 上記非磁性体基板が透明物質からなることを
特徴とする特許請求の範囲第１項記載の光学磁気
記録方法。[Claims] 1. Focused left-handed or right-handed circularly polarized light is applied to a magnetic recording medium that is provided on a non-magnetic substrate and is capable of perpendicular magnetic recording and has electrical conductivity. An optical magnetic recording method characterized in that a vertical magnetic field is formed in a magnetic recording medium by a rotating current consisting of an actual current generated in the magnetic recording medium by a rotating electric field, and information is recorded by the perpendicular magnetic field. . 2. The optical magnetic recording method according to claim 1, wherein the magnetic recording medium is made of a metal magnetic film. 3. The optical magnetic recording method according to claim 1, wherein the magnetic recording medium comprises a laminated film of an insulating magnetic film and a non-magnetic metal film. 4. The optical magnetic recording method according to claim 1, wherein the nonmagnetic substrate is made of a transparent material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20784681A JPS58108007A (en) | 1981-12-22 | 1981-12-22 | Optomagnetic recording method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20784681A JPS58108007A (en) | 1981-12-22 | 1981-12-22 | Optomagnetic recording method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58108007A JPS58108007A (en) | 1983-06-28 |
| JPH0213361B2 true JPH0213361B2 (en) | 1990-04-04 |
Family
ID=16546490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20784681A Granted JPS58108007A (en) | 1981-12-22 | 1981-12-22 | Optomagnetic recording method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58108007A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2894808B2 (en) * | 1990-07-09 | 1999-05-24 | 旭光学工業株式会社 | Optical system with polarized light |
| US9280996B2 (en) * | 2013-12-13 | 2016-03-08 | HGST Netherlands B.V. | All-optical magnetic recording system using FeMnPt media |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5760504A (en) * | 1980-09-30 | 1982-04-12 | Nippon Hoso Kyokai <Nhk> | Photomagnetic recorder |
-
1981
- 1981-12-22 JP JP20784681A patent/JPS58108007A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58108007A (en) | 1983-06-28 |
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