JPS61104445A - Photomagnetic recording medium - Google Patents
Photomagnetic recording mediumInfo
- Publication number
- JPS61104445A JPS61104445A JP22523784A JP22523784A JPS61104445A JP S61104445 A JPS61104445 A JP S61104445A JP 22523784 A JP22523784 A JP 22523784A JP 22523784 A JP22523784 A JP 22523784A JP S61104445 A JPS61104445 A JP S61104445A
- Authority
- JP
- Japan
- Prior art keywords
- film
- recording medium
- target
- compsn
- magnetic alloy
- 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
Landscapes
- Thin Magnetic Films (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は光磁気ディスクメモリに、用いられる磁性薄膜
記録媒体に関するもので、更に詳しくは、膜面と垂直方
向に磁化容易軸を有し、レーザーなどの元ビームを照射
した領域に反転磁区を作ることにより、情報を記録する
ことができ、8気光学効果を利用して読み出すことので
きる磁性薄膜記録媒体に関するものである。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a magnetic thin film recording medium used in a magneto-optical disk memory. The present invention relates to a magnetic thin film recording medium in which information can be recorded by creating inverted magnetic domains in a region irradiated with an original beam of a laser or the like, and which can be read out using the 8-magnetic optical effect.
(従来技術とその問題点)
元ディスクメモリは、高密度・大容量記録が可能であり
、かつ非接触ψ高速アクセスもできるという点から、大
容量ファイルメモリの一つとして近年注目を集めている
。その中でも、光磁気ディスクメモリは、記録情報の瞥
き換えが可能であるという利点金持っていることから、
各所で盛んに研究されている。(Prior art and its problems) Original disk memory has attracted attention in recent years as a type of large-capacity file memory because it is capable of high-density, large-capacity recording, and non-contact ψ high-speed access. . Among them, magneto-optical disk memory has the advantage of being able to review recorded information.
It is being actively researched in various places.
従来、その記録媒体としてはMnB1.MnCuB1な
どの多結晶体薄膜、Tb、 Gd、 DY などの希
土類金属と、F e e Coなどの鉄族i移金属との
組給わせによって作成される非晶質磁性合金i8M、G
IGなどの単結晶簿膜などが知られている。これらの薄
膜のうちで、非晶質母性合金薄膜は、善き込み感度が高
い、粒界ノイズがない、膜面に垂直方向の磁気異方性を
有する涙が容易に作れるなどの利点を有するため、記録
媒体として、最も有望視されている。Conventionally, MnB1. Amorphous magnetic alloys i8M and G created by combining polycrystalline thin films such as MnCuB1, rare earth metals such as Tb, Gd, and DY, and iron group i-transfer metals such as Fe e Co.
Single crystal films such as IG are known. Among these thin films, amorphous matrix alloy thin films have advantages such as high concentration sensitivity, no grain boundary noise, and easy formation of tears with magnetic anisotropy perpendicular to the film surface. , is considered the most promising as a recording medium.
周知の如く、この様な記録媒体においては、再生特性に
大きな影響を与えるカー回転角θk及び抗磁力HCと膜
組成には、第3図に示す様な関係がある。すなわち、カ
ー回転角θには、希土類濃度の増加に伴い単調減少し、
抗磁力Hcは、補償組成近傍で大きくなる。ここで、高
2比の再生出力を得るためにはθ、は、できるだけ大き
い方が好ましいが、抗磁力HCに関しては、記録再生方
式の要求に応じて大きさと補償組成に対する方向とを、
適宜、選択する必要がある。“従って、従来は、抗磁力
)(cの設定値に応じて、カー回転角θkが小さくなる
場合がしばしば生じた。例えば 。As is well known, in such a recording medium, there is a relationship as shown in FIG. 3 between the Kerr rotation angle θk, the coercive force HC, and the film composition, which greatly affect the reproduction characteristics. In other words, the Kerr rotation angle θ monotonically decreases as the rare earth concentration increases;
The coercive force Hc becomes large near the compensation composition. Here, in order to obtain a reproduction output with a high 2 ratio, it is preferable that θ is as large as possible, but regarding the coercive force HC, the magnitude and the direction for the compensation composition are determined according to the requirements of the recording and reproduction method.
It is necessary to select as appropriate. Therefore, in the past, depending on the set value of coercive force (c), the Kerr rotation angle θk often became small. For example.
’pbpeの場合、記録再生特性上、補償組成に対して
Tb1Jツチ組成が艮いとされているが、これを大面積
にわたり特性ムラを小さく形成するにはHcの組成によ
る変化が大きい補償組成近傍を避け、それからややはな
れた低Hc領域を選択する必要があった。この場合、カ
ー回転角θには小さくなるので、再生出力は小さくなる
という問題を生じた。In the case of 'pbpe, it is said that the Tb1J Tsuchi composition is the best for the compensation composition in terms of recording and reproducing characteristics, but in order to reduce characteristic unevenness over a large area, the vicinity of the compensation composition where the change due to the Hc composition is large is It was necessary to select a low Hc region that was avoided and slightly separated from it. In this case, since the Kerr rotation angle θ becomes small, a problem arises in that the reproduction output becomes small.
(発明の目的)
本発明は、上記問題全解決するために成されたものであ
り、カー回転角θkを、変えずに、抗磁力Hct−変え
ることのできる非晶質磁性合金薄膜を記録媒体とした光
磁気記録媒体を提供することKある。(Objective of the Invention) The present invention has been made to solve all of the above problems, and provides a recording medium with an amorphous magnetic alloy thin film that can change the coercive force Hct without changing the Kerr rotation angle θk. It is an object of the present invention to provide a magneto-optical recording medium having the following characteristics.
(発明の構成)
本発明にかかる光磁気記録媒体は、膜面と垂直方向に磁
化容易軸を有し、希土類元素と鉄族遷移元素とIb族元
素を主成分とする磁性合金を記録層とすることt−特徴
とする。(Structure of the Invention) The magneto-optical recording medium according to the present invention has an axis of easy magnetization in the direction perpendicular to the film surface, and has a recording layer made of a magnetic alloy mainly composed of rare earth elements, iron group transition elements, and group Ib elements. To do t-Characterize.
(実施例) 以下、本発明の実施例一つ−て詳細に説明する。(Example) Hereinafter, one embodiment of the present invention will be described in detail.
膜の作製には高周波スパッタ装置を用いた。ターゲット
としては、pe板上にTbとIb族元素のCuもしくは
Ag t’′分散配置した複合ターゲットを用いた。組
成はターゲットの面積比で’l’bi2Fess−xX
x (x=cu# Ag)となる様に調整した。X=O
Kおける膜組成はXMAによれば、’1’b 27 a
t%であり補償組成に対してTb1Jツチであった。以
下にスパッタ条件をまとめて示丸ターゲ7−)
Tb sz Fe @s−1Xx(X=Cut Ag)
基 板 ガ ラ ス
背圧2×10″7Torr以下
Arカス圧4X10 TOrr
スパッタパワー 3W/d
電極間距離 5α
第1図は本発明の第1の実施例を示したもので6t)T
bFeにIb族元素としてCu ′t−添加した時の
、カー回転角θにと抗磁力1(cの変イヒを示したもの
である。膜厚は1500Aであり、膜は全て補償組成に
対してTbリッチの特性を示し、膜面に垂直方向の磁化
容易軸を有し、さらにX線的に非晶質であった。第1図
によると’l’、bFeへCut−3,5%迄、添加す
るにつれて、抗磁力HCは3.5KOCから、IKOe
迄低下り、りd=、カー回転角θには全く変らなかった
。A high frequency sputtering device was used to prepare the film. As a target, a composite target in which Tb and Cu or Ag t'' of group Ib elements were dispersed on a PE plate was used. The composition is the target area ratio 'l'bi2Fess-xX
x (x=cu#Ag). X=O
According to XMA, the film composition at K is '1'b 27 a
t% and was Tb1J with respect to the compensation composition. The sputtering conditions are summarized below for target 7-)
Tb sz Fe @s-1Xx (X=Cut Ag) Substrate Glass Back pressure 2 x 10'' 7 Torr or less Ar gas pressure 4 x 10 TOrr Sputtering power 3 W/d Distance between electrodes 5α Figure 1 shows the first embodiment of the present invention. Showing examples 6t)T
This figure shows the change in the Kerr rotation angle θ and the coercive force 1 (c) when Cu′t− is added as a group Ib element to bFe.The film thickness is 1500A, and all films are The film exhibited Tb-rich characteristics, had an easy axis of magnetization perpendicular to the film surface, and was X-ray amorphous.According to Figure 1, 'l', Cut-3.5% to bFe As it is added, the coercive force HC increases from 3.5KOC to IKOe.
However, there was no change in the Kerr rotation angle θ at all.
第2図は、本発明の第2の実施例を示したものであり、
TbFeにIb族元素としてAgを添力口した時のカー
回転角θにと抗磁力1(c の変化を示したものであ
る。この場合も、得られた厚さ1500Aの膜は、全て
非晶質の垂直磁化膜であり、補償組成に対してTb1J
ツチの特性を示した。そして、TbFe ヘAg t−
3,596迄添加するにつれて、抗磁力Hcは、3.5
KOe から1.5KOej迄低下したが、カー回転角
θには全く変わらなかった。FIG. 2 shows a second embodiment of the present invention,
The figure shows the change in coercive force 1 (c) as a function of the Kerr rotation angle θ when Ag is added as an Ib group element to TbFe. In this case as well, the obtained film with a thickness of 1500 A is entirely non-conductive. It is a crystalline perpendicular magnetization film, and Tb1J for the compensation composition.
It showed the characteristics of Tutsi. And TbFe hair Ag t-
As it is added up to 3,596, the coercive force Hc increases to 3.5
Although the value decreased from KOe to 1.5KOej, the Kerr rotation angle θ did not change at all.
さらにAg又はCu15.0%を越えて添加しても前記
効果は変らなかったが、しかし10〜20チの範囲にな
ると磁気特性が劣化し光磁気記録媒体としては不適当に
なる。Furthermore, even if Ag or Cu was added in an amount exceeding 15.0%, the above effect did not change; however, when the amount was in the range of 10 to 20%, the magnetic properties deteriorated and the material became unsuitable as a magneto-optical recording medium.
以上述べたIb族元素のTbFeへの添加効果は、上述
の組成に限定されるものではなく、TbxFesao−
x (18−X 35 at %)で示される全組成
に対して、同様の効果が見られた。さらにIb族元素と
してAuについても効果を確認した。The above-mentioned effect of adding group Ib elements to TbFe is not limited to the above-mentioned composition;
A similar effect was observed for all compositions denoted by x (18-X 35 at %). Furthermore, the effect of Au as a group Ib element was also confirmed.
また、上記効果は他の希土類と鉄族遷移元素からなる磁
性合金、例えばTbpeCo、QdTbpe。The above effect can also be achieved by other magnetic alloys made of rare earth elements and iron group transition elements, such as TbpeCo and QdTbpe.
GdTbFeCo、TbFeNi、TbFeNiCoに
対しても同様に見られた。Similar results were observed for GdTbFeCo, TbFeNi, and TbFeNiCo.
(発明の効果)
以上述べた様に、本発明によれば、カー回転角θkを変
えずに、抗磁力Hcを変えることのできる非晶質磁性合
金薄膜を記録媒体とした光磁気記録媒体全提供できる。(Effects of the Invention) As described above, according to the present invention, a magneto-optical recording medium using an amorphous magnetic alloy thin film that can change the coercive force Hc without changing the Kerr rotation angle θk can be used. Can be provided.
従って、本発明は記#:再生方式に応じた媒体設計に轟
り、有効に活用できる。Therefore, the present invention can be effectively utilized in media design according to the playback method.
第1図、第2図は本発明の実施例金示す図、第3図は、
従来例を説明するための図である。
多 1 図
Cu量 X%
多 2 l
Agt x%Figures 1 and 2 show examples of the present invention, and Figure 3 shows
FIG. 2 is a diagram for explaining a conventional example. Multi 1 Figure Cu amount X% Multi 2 l Agt x%
Claims (1)
と鉄族遷移元素と I b族元素を主成分とする磁性合金
を記録層とすることを特徴とする光磁気記録媒体。(1) A magneto-optical recording medium characterized by having an axis of easy magnetization perpendicular to the film surface and having a recording layer made of a magnetic alloy containing a rare earth element, an iron group transition element, and an Ib group element as main components.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22523784A JPS61104445A (en) | 1984-10-26 | 1984-10-26 | Photomagnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22523784A JPS61104445A (en) | 1984-10-26 | 1984-10-26 | Photomagnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61104445A true JPS61104445A (en) | 1986-05-22 |
Family
ID=16826140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22523784A Pending JPS61104445A (en) | 1984-10-26 | 1984-10-26 | Photomagnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61104445A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5968854A (en) * | 1982-09-28 | 1984-04-18 | Seiko Instr & Electronics Ltd | Photomagnetic recording medium |
JPS5984358A (en) * | 1982-11-04 | 1984-05-16 | Seiko Instr & Electronics Ltd | Photomagnetic recording medium |
JPS60246041A (en) * | 1984-05-21 | 1985-12-05 | Canon Inc | Photo thermomagnetic recording medium |
-
1984
- 1984-10-26 JP JP22523784A patent/JPS61104445A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5968854A (en) * | 1982-09-28 | 1984-04-18 | Seiko Instr & Electronics Ltd | Photomagnetic recording medium |
JPS5984358A (en) * | 1982-11-04 | 1984-05-16 | Seiko Instr & Electronics Ltd | Photomagnetic recording medium |
JPS60246041A (en) * | 1984-05-21 | 1985-12-05 | Canon Inc | Photo thermomagnetic recording medium |
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