JPH0658844B2 - Magneto-optical recording medium - Google Patents
Magneto-optical recording mediumInfo
- Publication number
- JPH0658844B2 JPH0658844B2 JP58070329A JP7032983A JPH0658844B2 JP H0658844 B2 JPH0658844 B2 JP H0658844B2 JP 58070329 A JP58070329 A JP 58070329A JP 7032983 A JP7032983 A JP 7032983A JP H0658844 B2 JPH0658844 B2 JP H0658844B2
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- magneto
- optical recording
- alloy layer
- layer
- 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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/16—Layers for recording by changing the magnetic properties, e.g. for Curie-point-writing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Thin Magnetic Films (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、情報を熱磁気的に記録し、磁気光学的に再生
するのに適した光磁気記録媒体に関するものである。こ
の光磁気記録媒体は書換え可能な高密度記録媒体であ
り、情報化社会において広い用途が期待される。Description: FIELD OF THE INVENTION The present invention relates to a magneto-optical recording medium suitable for thermomagnetically recording and magneto-optically reproducing information. This magneto-optical recording medium is a rewritable high-density recording medium, and is expected to be widely used in the information society.
従来例の構成とその問題点 従来、この光磁気記録媒体では非磁性体基板を備え、前
記基板は記録層として重希土類金属−遷移金属系の非晶
質合金層を支持している。Configuration of Conventional Example and Problems Thereof Conventionally, this magneto-optical recording medium includes a non-magnetic substrate, and the substrate supports a heavy rare earth metal-transition metal amorphous alloy layer as a recording layer.
前記非晶質合金層は、一般的に重希土類金属の組成比が
１０ａｔ％〜３０ａｔ％の範囲において層面に垂直な一
軸磁気異方性を有するとともに、比較的大きい磁気光学
的効果（ファラデー効果，カー効果）を有している。In general, the amorphous alloy layer has a uniaxial magnetic anisotropy perpendicular to the layer surface when the composition ratio of heavy rare earth metal is in the range of 10 at% to 30 at%, and has a relatively large magneto-optical effect (Faraday effect, Has the Kerr effect).
記録再生は次のようにして行われる。即ち、焦点を合わ
せたレーザ光線によって合金層をそれぞれ補償温度以上
もしくはキュリー温度以上に局部的に加熱する。そして
層面に垂直方向の外部磁場を加えて層面に対して望む垂
直方向に層の加熱領域を磁化することができる。層の加
熱領域を冷却後、抗磁力が層の磁気力に変化する領域を
安定させるのに充分であれば、安定領域の大きさを直径
１ミクロン程度にまですることができる。Recording and reproduction are performed as follows. That is, the alloy layer is locally heated by the focused laser beam to the compensation temperature or higher or the Curie temperature or higher. Then, an external magnetic field in the vertical direction can be applied to the layer surface to magnetize the heating region of the layer in the desired vertical direction with respect to the layer surface. After cooling the heated region of the layer, the size of the stable region can be as small as about 1 micron if it is sufficient to stabilize the region where the coercive force changes to the magnetic force of the layer.
論理数「１」または「０」に相当する情報値を層の領域
の磁化方向に従って割り当て記録できる。再生は直線偏
光ビームを用いて層の領域の磁化方向を、ファラデー効
果もしくはカー効果によって検出して行なう。Information values corresponding to the logical number "1" or "0" can be assigned and recorded according to the magnetization direction of the layer region. Reproduction is performed by using a linearly polarized beam to detect the magnetization direction of the layer region by the Faraday effect or Kerr effect.
従来の記録媒体の欠点は、ファラデー効果及びカー効果
が充分大きくなく、再生特性に難点があることである。A drawback of the conventional recording medium is that the Faraday effect and the Kerr effect are not sufficiently large, and the reproduction characteristics are difficult.
ファラデー効果やカー効果の改善については、特開昭５
５−１３０１０６号公報にビスマスまたはスズを添加す
ることが記載されているが、ビスマス，スズはともに融
点３００℃以下の低融点金属であるためにスパッタリン
グ法による合金層の作製の場合には、ターゲットの温度
をビスマス，スズの融点未満に抑制する必要が生じ、こ
のため単一ターゲット電極による合金層の作製が困難と
なる欠点があった。For the improvement of the Faraday effect and the Kerr effect, see JP-A-5
Although the addition of bismuth or tin is described in Japanese Patent Laid-Open No. 5-130106, both of bismuth and tin are low melting point metals having a melting point of 300 ° C. or less, and therefore, in the case of producing an alloy layer by a sputtering method, a target is used. It is necessary to suppress the temperature of the alloy to less than the melting points of bismuth and tin, which makes it difficult to form an alloy layer with a single target electrode.
発明の目的 本発明の目的は、従来の重希土類金属−遷移金属の非晶
質合金からなる光磁気記録媒体に比較して、ファラデー
効果、カー効果の大きい光磁気記録媒体を提供すること
である。OBJECT OF THE INVENTION It is an object of the present invention to provide a magneto-optical recording medium having a large Faraday effect and Kerr effect as compared with a conventional magneto-optical recording medium composed of an amorphous alloy of heavy rare earth metal-transition metal. .
発明の構成 本発明は上記目的を達するため、重希土類金属−遷移金
属の非晶質合金に少なくとも１原子％のプラセオジウム
を添加したものであり、これによりカー回転角を約１５
％増加させたものである。In order to achieve the above object, the present invention is an amorphous alloy of heavy rare earth metal-transition metal to which at least 1 atom% of praseodymium is added, whereby a Kerr rotation angle of about 15 is obtained.
% Increased.
この所望の垂直磁気異方性を有する合金層を得るのは、
この合金層が一般式 Ｍ1-x（Ｒ1-yＰｒｙ）ｘ （式中ＲはＧｄ，Ｔｂのうち少なくとも１種の元素を含
み、Ｍは少なくともＦｅを含む鉄系遷移金属であり、ｘ
は0.1＜ｘ≦0.3、ｙは0.01≦ｘｙ≦0.15である。）で示
される組成を有する場合である。To obtain an alloy layer having this desired perpendicular magnetic anisotropy,
This alloy layer has a general formula M 1-x (R 1-y Pr y ) x (wherein R is at least one element of Gd and Tb, and M is an iron-based transition metal containing at least Fe, x
Is 0.1 <x ≦ 0.3 and y is 0.01 ≦ xy ≦ 0.15. ) Is a case where it has a composition shown by.
実施例の説明 以下、本発明の実施例について、図面を参照しなら説明
する。Description of Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
本実施例の試料は、ガドリニウム、テリビウム、鉄及び
プラセオジウムからなる非晶質合金層であり、スパッタ
リング法によって作製した。The sample of this example is an amorphous alloy layer made of gadolinium, terbium, iron and praseodymium, and was prepared by the sputtering method.
Ｐｒの融点は約９３５℃であるから遷移金属、重希土類
金属及びＰｒからなる複合ターゲットを用いることがで
きる。Since the melting point of Pr is about 935 ° C., a composite target composed of a transition metal, a heavy rare earth metal and Pr can be used.
スパッタリング漕内を１×１０-7〜２×１０-7Torrの真
空にした後、漕内に高純度のアルゴンを導入して５×１
０-3Torrの圧力でスパッタリングを行い、ガラス基板上
に２００〜１０００Åの合金層を作製した。The inside of the sputtering tank was evacuated to 1 × 10 -7 to 2 × 10 -7 Torr, and then high-purity argon was introduced into the tank to obtain 5 × 1.
Sputtering was performed at a pressure of 0 -3 Torr to form an alloy layer of 200 to 1000 Å on the glass substrate.
このように作製した合金層の組成は次のようであった。The composition of the alloy layer thus produced was as follows.
Ｆｅ0.73｛（Ｇｄ0.56Ｔｂ0.44）1-yＰｒｙ｝0.27な
お、0.27ｙは０〜0.15である。Fe 0.73 {(Gd 0.56 Tb 0.44 ) 1-y Pr y } 0.27 Note that 0.27y is 0 to 0.15.
図面はプラセオジウムの含有量ｙに対する上記非晶質合
金層からなる記録媒体のカー回転角の変化を示したもの
である。The drawing shows the change in the Kerr rotation angle of the recording medium composed of the amorphous alloy layer with respect to the content y of praseodymium.
図に示すように、プラセオジウムを添加することによっ
て、カー回転角は無添加時の約0.4から添加時の約0.47
となり、このように記録媒体のカー回転角を約１５％増
加させることができる。As shown in the figure, by adding praseodymium, the Kerr rotation angle changes from about 0.4 without addition to about 0.47 with addition.
Thus, the Kerr rotation angle of the recording medium can be increased by about 15%.
発明の効果 以上のように本発明は、垂直磁気異方性を有する重希土
類金属−遷移金属系非晶質合金層を記録層として有し、
前記合金層を一般式 Ｍ1-x（Ｒ1-yＰｒｙ）ｘ （式中ＲはＧｄ，Ｔｂのうち少なくとも１種の元素を含
み、Ｍは少なくともＦｅを含む鉄系遷移金属であり、ｘ
は0.1＜ｘ≦0.3、ｙは0.01≦ｘｙ≦0.15である。）で示
される組成とすることにより、記録媒体のカー回転角を
約１５％増加させることができ、優れた効果を奏するも
のである。Effects of the Invention As described above, the present invention has a heavy rare earth metal-transition metal amorphous alloy layer having perpendicular magnetic anisotropy as a recording layer,
The alloy layer may be represented by the general formula M 1-x (R 1-y Pr y ) x (wherein R contains at least one element of Gd and Tb, and M is an iron-based transition metal containing at least Fe, x
Is 0.1 <x ≦ 0.3 and y is 0.01 ≦ xy ≦ 0.15. With the composition shown in (1), the Kerr rotation angle of the recording medium can be increased by about 15%, and an excellent effect is exhibited.
図は本発明による一実施例のＧｄ−Ｔｂ−Ｆｅ−Ｐｒ非
晶質合金層からなる記録媒体のカー回転角のプラセオジ
ウム含有量に対する変化を示す特性図である。The figure is a characteristic diagram showing the change of the Kerr rotation angle with respect to the praseodymium content of the recording medium comprising the Gd-Tb-Fe-Pr amorphous alloy layer of one example according to the present invention.
Claims (2)
移金属系非晶質合金層を記録層として有し、前記合金層
が一般式 Ｍ1-x（Ｒ1-yＰｒｙ）ｘ （式中ＲはＧｄ，Ｔｂのうち少なくとも１種の元素を含
み、Ｍは少なくともＦｅを含む鉄系遷移金属であり、ｘ
は0.1＜ｘ≦0.3、ｙは0.01≦ｘｙ≦0.15である。）で示
される組成であることを特徴とする光磁気記録媒体。1. A heavy rare earth metal-transition metal amorphous alloy layer having perpendicular magnetic anisotropy is used as a recording layer, and the alloy layer has the general formula M 1-x (R 1-y Pr y ) x. (In the formula, R contains at least one element of Gd and Tb, M is an iron-based transition metal containing at least Fe, and x
Is 0.1 <x ≦ 0.3 and y is 0.01 ≦ xy ≦ 0.15. ) A magneto-optical recording medium having a composition represented by
る。）であり、ＭはＦｅであり、ｘは0.2≦ｘ≦0.3、ｙ
は0.01≦ｘｙ≦0.15である特許請求の範囲第１項記載の
光磁気記録媒体。2. R is Gd 1 -z Tbz (z is 0 ≦ z ≦ 1), M is Fe, x is 0.2 ≦ x ≦ 0.3, y
The magneto-optical recording medium according to claim 1, wherein is 0.01 ≦ xy ≦ 0.15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58070329A JPH0658844B2 (en) | 1983-04-20 | 1983-04-20 | Magneto-optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58070329A JPH0658844B2 (en) | 1983-04-20 | 1983-04-20 | Magneto-optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59195808A JPS59195808A (en) | 1984-11-07 |
| JPH0658844B2 true JPH0658844B2 (en) | 1994-08-03 |
Family
ID=13428280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58070329A Expired - Lifetime JPH0658844B2 (en) | 1983-04-20 | 1983-04-20 | Magneto-optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0658844B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6212941A (en) * | 1985-07-09 | 1987-01-21 | Seiko Epson Corp | Photomagnetic recording medium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59103314A (en) * | 1982-12-03 | 1984-06-14 | Seiko Instr & Electronics Ltd | Photomagnetic recording medium |
-
1983
- 1983-04-20 JP JP58070329A patent/JPH0658844B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59195808A (en) | 1984-11-07 |
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