JPS6243848A - Photomagnetic recording medium - Google Patents
Photomagnetic recording mediumInfo
- Publication number
- JPS6243848A JPS6243848A JP18250785A JP18250785A JPS6243848A JP S6243848 A JPS6243848 A JP S6243848A JP 18250785 A JP18250785 A JP 18250785A JP 18250785 A JP18250785 A JP 18250785A JP S6243848 A JPS6243848 A JP S6243848A
- Authority
- JP
- Japan
- Prior art keywords
- film
- magnetized film
- soft magnetic
- perpendicularly magnetized
- recording medium
- 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
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
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、光磁気記録媒体、例えば、光の照射により書
き込み、読み出しができ、書き換えが可能な記録媒体に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magneto-optical recording medium, for example, a recording medium that can be written to and read from by irradiation with light and is rewritable.
本発明は、光磁気記録媒体におｉで、基板上に垂直磁化
膜の保磁力を増大させる歪異方性を誘起する下地層を介
して垂直磁化膜を形成し、さらに垂直磁化膜上に軟磁性
膜を形成することにより、垂直磁化膜の保磁力を増大さ
せかつ、書き込んだ磁区を安定化させたものである。The present invention provides a magneto-optical recording medium in which a perpendicularly magnetized film is formed on a substrate through an underlayer that induces strain anisotropy that increases the coercive force of the perpendicularly magnetized film, and then a perpendicularly magnetized film is formed on the perpendicularly magnetized film. By forming a soft magnetic film, the coercive force of the perpendicularly magnetized film is increased and the written magnetic domain is stabilized.
公知（特公昭６Ｏ−５５５３５）のように、非磁性基板
上に、垂直磁化膜の保磁力を増大させる歪異方性を誘起
する下地層を介して垂直磁化Ｍを形成し、保磁力を増大
させ、書き込んだ磁区のバブル径を小さくすることがで
きる。As known (Japanese Patent Publication No. 6O-55535), perpendicular magnetization M is formed on a nonmagnetic substrate via an underlayer that induces strain anisotropy that increases the coercive force of the perpendicularly magnetized film, thereby increasing the coercive force. This allows the bubble diameter of the written magnetic domain to be reduced.
しかし、従来の方法では、基板と記録層（垂直磁化膜）
との間に下地層重おくため、カー効果あるいはファラデ
ー効果により読み出す際に所定のＣ／Ｎを得るためには
、読み出し時のレーザー出力をあげなければならない。However, in the conventional method, the substrate and recording layer (perpendicularly magnetized film)
In order to obtain a predetermined C/N during readout due to the Kerr effect or Faraday effect, the laser output during readout must be increased.
その結果生ずる温度上昇に１つ垂直磁化膜の書き込み磁
区０減磁が起き ′ｉてしまう。As a result, the temperature rise causes zero demagnetization of the write magnetic domain of the perpendicularly magnetized film.
そこで、本発明はこのような問題点を解決するもので、
その目的とするところは、再生時の温度上昇に伴なう減
Ｖ１１を抑えるため、基板上に垂直磁化膜の保磁力を増
大させる歪異方性’ｔ９起する軟磁性層を介して垂直磁
化膜を形成した従来方式に加えて、垂直磁化膜上にさら
に軟磁性層を形成し、垂直磁化膜から生ずる磁束を閉じ
させることにより、従来のものに比べて、書き込んだ磁
区を安定化させるものである。Therefore, the present invention aims to solve these problems.
The purpose of this is to suppress perpendicular magnetization through a soft magnetic layer that causes strain anisotropy 't9, which increases the coercive force of the perpendicularly magnetized film on the substrate, in order to suppress the decrease in V11 caused by temperature rise during reproduction. In addition to the conventional method of forming a film, a soft magnetic layer is formed on the perpendicularly magnetized film to close the magnetic flux generated from the perpendicularly magnetized film, thereby making the written magnetic domain more stable than the conventional method. It is.
本発明の光磁気記録媒体は非磁性基体上に、垂直磁化膜
の保磁力を増大させる型具方性を銹起する軟磁性膜より
なる地層を介して、希土類金属と遷移金属を主体とする
垂直磁化膜を形成し、さらに、垂直磁化膜上に軟磁性膜
を形成した光磁気記録媒体である。The magneto-optical recording medium of the present invention is formed by depositing rare earth metals and transition metals on a non-magnetic substrate through a layer of soft magnetic film that exhibits a specificity that increases the coercive force of the perpendicularly magnetized film. This is a magneto-optical recording medium in which a perpendicular magnetization film is formed and a soft magnetic film is further formed on the perpendicular magnetization film.
第１図に本発明の機構の概念図を示す、垂直磁化膜から
生じた磁束を基板上の下地層および垂直磁化膜上の軟磁
性層内を通し、閉じた磁気回路を構成することにより書
き込み磁区の安定化をはかったものである。Figure 1 shows a conceptual diagram of the mechanism of the present invention. Writing is performed by passing the magnetic flux generated from the perpendicularly magnetized film through the underlayer on the substrate and the soft magnetic layer on the perpendicularly magnetized film to form a closed magnetic circuit. This is aimed at stabilizing the magnetic domain.
〔実施例〕 実施例により本発明の効果について述べる。〔Example〕 The effects of the present invention will be described with reference to Examples.
ガラス基板上にＦｅｆ２０にの厚さにスパッタリングし
て下地層を形成し、下地層の上に組成式でＴｂ ｏ、ｌ
ａ （Ｆ’６ ｏ、ｔＣｏ ｏ、ａ ） ０−８２
で表わされる垂直磁化膜を形成し、さらにＦｅを２ＯＡ
の厚さにスパッタリングした。このようにして得た光磁
気記録媒体の臆面に対して垂面な方向の磁化曲線を第２
図に示す。A base layer is formed on a glass substrate by sputtering to a thickness of Fef20, and Tb o, l is formed on the base layer with the composition formula.
a (F'6 o, tCo o, a) 0-82
A perpendicularly magnetized film represented by
sputtered to a thickness of . The magnetization curve in the direction perpendicular to the oblique surface of the magneto-optical recording medium obtained in this way is
As shown in the figure.
また、ガラス基板上に直接、Ｔｂ０−１＋１（”’０，
７ＣＱＯ，３）Ｏ−ａｍを形成した場合の膜面に対して
垂直な磁化曲線を嬉３図に示す。In addition, Tb0-1+1("'0,
Figure 3 shows the magnetization curve perpendicular to the film surface when 7CQO, 3)O-am is formed.
第２図、第３図かられかるように、本発明の方式では、
保磁力が増大している。As can be seen from FIGS. 2 and 3, in the method of the present invention,
Coercive force is increasing.
第２図に示した本発明の方式による光磁気記録媒体の読
み出し時のＣ／Ｎ比と読みだしレーザーパワーの関係を
第４図に示す、さらに第４図には、従来方式、すなわち
、下地層（Ｆｅ ２０Ｘ）と垂直磁化膜からなる光磁気
記録媒体の読みだし時のＣハ比と読みだし＋１ａ蝉滑？
クンごの関係も示しである。FIG. 4 shows the relationship between the C/N ratio and readout laser power when reading out the magneto-optical recording medium according to the method of the present invention shown in FIG. 2. Furthermore, FIG. C ratio and readout +1a cicada slippage when reading from a magneto-optical recording medium consisting of a geological layer (Fe 20X) and a perpendicularly magnetized film?
The relationship between Kungo is also an indication.
いずれの場合もレーザー光は基板側から入射した。In both cases, the laser light entered from the substrate side.
従来方式では、レーザーパワーの増大に伴ないＣ，／Ｍ
比は増大してゆくが、Ｃハ比がピークをとったあと、レ
ーザーパワーの増大に伴なってＣハ比は減少してゆく、
これは、垂直磁化膜の減磁によるものと考えられる。一
方、本発明の方式では、Ｃ／Ｎ比のピーク＠を従来方式
に比べて高レーザーパワー側ヘシフトし、Ｃハ比のピー
ク呟は従来方式に比べて、４ｄＢはど向上している。In the conventional method, as the laser power increases, C,/M
The ratio increases, but after the C ratio reaches its peak, the C ratio decreases as the laser power increases.
This is considered to be due to demagnetization of the perpendicularly magnetized film. On the other hand, in the method of the present invention, the peak of the C/N ratio is shifted to the higher laser power side compared to the conventional method, and the peak of the C/N ratio is improved by 4 dB compared to the conventional method.
なお、本実施例では、下地層あるｈけ軟磁性層として？
、を用いているが、７６Ｎイ、好ましくは、非晶質なＦ
ＡＮイＳイＢなども用いることができる。In this example, the underlayer is used as a soft magnetic layer.
, but 76N, preferably amorphous F
AN iS iB etc. can also be used.
また、上述した例では、非磁性基体がガラス基体である
が、その他アクリル基板、ポリカー砿ネート基板、高分
子フィルムなどを用することもできる。Further, in the above-mentioned example, the nonmagnetic substrate is a glass substrate, but other materials such as an acrylic substrate, a polycarbonate substrate, and a polymer film can also be used.
上述したように本発明によれば下地層、軟磁性層を設け
ることにより簿膜の異方性を向上し、保磁力をあげるこ
とができ、さらに再生時の温度上昇による減磁を抑える
ことができる。As described above, according to the present invention, by providing an underlayer and a soft magnetic layer, it is possible to improve the anisotropy of the magnetic film and increase the coercive force, and furthermore, it is possible to suppress demagnetization due to temperature rise during reproduction. can.
帆１図二本発明における光磁気記録媒体の概念図。
鏑２図二本発明におけるＴｂｏ−１ｓ（’ｇｏ、ｒＣｏ
ｏ−ｓ）ｏ、ｓｚの磁気特性図。
第３図ニガラス基板に直接Ｔｂｏ、ｔｓ（’Ｆｇｏ、７
Ｃｏｏ、ｓ）ｏ、ｓｚを形成した薄膜の磁気特性図。
嬉４図：従来例と本発明におけるＣ／１Ｊとレーザーパ
ワーの関係図。
以 上Figure 1: Conceptual diagram of the magneto-optical recording medium of the present invention. Figure 2: Tbo-1s ('go, rCo) in the present invention
o-s) Magnetic characteristic diagram of o, sz. Figure 3 Tbo, ts ('Fgo, 7
A magnetic characteristic diagram of a thin film formed with Coo, s) o, sz. Figure 4: Relationship diagram between C/1J and laser power in the conventional example and the present invention. that's all
Claims (1)
方性を誘起するような軟磁性層よりなる下地層を介して
、希土類と遷移金属を主体とする垂直磁化膜を形成し、
さらに上記、垂直磁化膜上に軟磁性膜を形成したことを
特徴とする光磁気記録媒体。A perpendicularly magnetized film mainly composed of rare earths and transition metals is formed on a nonmagnetic substrate via an underlayer made of a soft magnetic layer that induces strain anisotropy that increases the coercive force of the perpendicularly magnetized film.
Furthermore, a magneto-optical recording medium characterized in that a soft magnetic film is formed on the perpendicularly magnetized film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18250785A JPS6243848A (en) | 1985-08-20 | 1985-08-20 | Photomagnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18250785A JPS6243848A (en) | 1985-08-20 | 1985-08-20 | Photomagnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6243848A true JPS6243848A (en) | 1987-02-25 |
Family
ID=16119505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18250785A Pending JPS6243848A (en) | 1985-08-20 | 1985-08-20 | Photomagnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6243848A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6394449A (en) * | 1986-10-08 | 1988-04-25 | Sony Corp | Magneto-optical recording medium |
| JPS6467740A (en) * | 1987-09-08 | 1989-03-14 | Brother Ind Ltd | Optical magnetic disk |
| JPH01171143A (en) * | 1987-12-25 | 1989-07-06 | Sharp Corp | Magneto-optical recording medium |
| EP0827143A2 (en) * | 1990-06-13 | 1998-03-04 | Sharp Kabushiki Kaisha | Magneto-optical recording/reproducing device |
-
1985
- 1985-08-20 JP JP18250785A patent/JPS6243848A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6394449A (en) * | 1986-10-08 | 1988-04-25 | Sony Corp | Magneto-optical recording medium |
| JPS6467740A (en) * | 1987-09-08 | 1989-03-14 | Brother Ind Ltd | Optical magnetic disk |
| JPH01171143A (en) * | 1987-12-25 | 1989-07-06 | Sharp Corp | Magneto-optical recording medium |
| 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 |
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