JPS61246946A - Photomagnetic recording medium - Google Patents
Photomagnetic recording mediumInfo
- Publication number
- JPS61246946A JPS61246946A JP8728985A JP8728985A JPS61246946A JP S61246946 A JPS61246946 A JP S61246946A JP 8728985 A JP8728985 A JP 8728985A JP 8728985 A JP8728985 A JP 8728985A JP S61246946 A JPS61246946 A JP S61246946A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- film
- magneto
- optical recording
- 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
Landscapes
- Thin Magnetic Films (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明はＥＤＲＡＷ型光ディスクに関し、特に希土類金
属−遷移金属アモルファス合金を光記録膜とした光磁気
記録媒体に関する。TECHNICAL FIELD The present invention relates to an EDRAW type optical disk, and more particularly to a magneto-optical recording medium having an optical recording film made of a rare earth metal-transition metal amorphous alloy.
背景技術
従来から、一定の条件下で例えば高周波スパッタリング
等の方法で作成される希土類金属と遷移金属との合金例
えばａｄＴｂＦｅ （ガドリニウム−テルビウム−鉄）
、ＴｂＦｅＣｏ （テルビウム−鉄−コバルト）等の合
金１１１１１は、アモルファス構造をとり、膜面に垂直
な一軸磁気異方性を右することが知られている。BACKGROUND ART Conventionally, alloys of rare earth metals and transition metals such as adTbFe (gadolinium-terbium-iron) have been produced under certain conditions by a method such as high-frequency sputtering.
It is known that alloy 11111 such as TbFeCo (terbium-iron-cobalt) has an amorphous structure and exhibits uniaxial magnetic anisotropy perpendicular to the film surface.
この性質を光磁気記録媒体の記録膜として利用すること
が出来る。すなわち、情報の記録読取りについては次の
ように行う。先ず、−軸磁気異方性を有するアモルファ
ス合金膜上にレーザ光を焦光してその焦光部分をキュー
リ一温度又は補償温度付近まで局部的に加熱せしめる。This property can be utilized as a recording film of a magneto-optical recording medium. That is, recording and reading of information is performed as follows. First, a laser beam is focused onto an amorphous alloy film having -axis magnetic anisotropy, and the focused portion is locally heated to around the Curie temperature or compensation temperature.
この時の焦光部分における熱消磁又は磁化反転の熱的効
果によって、一方向に一様に磁化された合金膜面内に反
転磁区を形成することが出来る。次に、形成された反転
磁区に偏光レーザ光を入射し、その反射光におけるファ
ラデー効果又はカー効果による偏光楕円体の主軸の回転
と、楕円率の変化から反転磁区の有無を信号として検出
できる。このようにして、上記記録媒体において反転磁
区の有無を１″、パＯ″に対応させることによって記録
読取りが可能となる。At this time, due to the thermal effect of thermal demagnetization or magnetization reversal in the focused portion, a reversed magnetic domain can be formed in the plane of the alloy film that is uniformly magnetized in one direction. Next, a polarized laser beam is incident on the formed reversed magnetic domain, and the presence or absence of a reversed magnetic domain can be detected as a signal from the rotation of the principal axis of the polarization ellipsoid due to the Faraday effect or Kerr effect in the reflected light and the change in ellipticity. In this way, recording and reading becomes possible by associating the presence or absence of inverted magnetic domains with 1'' and paO'' in the recording medium.
従来からの希土類金属と遷移金属とのアモルファス合金
例えばＧｄＴｂＦｅ、ＴｂＦｅＣｏ等は光磁気効果及び
磁気特性、特にキューリ一点、補償温度が低くかつ保磁
力があり光磁気記録材料として適しているため光磁気記
録媒体の記録膜材として注目され実用化が進んでいる。Conventional amorphous alloys of rare earth metals and transition metals, such as GdTbFe and TbFeCo, have magneto-optical effects and magnetic properties, especially the Curie point, low compensation temperature, and high coercive force, making them suitable as magneto-optical recording materials. It is attracting attention as a recording film material for media and is being put into practical use.
しかしながら、これらアモルファス合金が酸化し易い故
に高温、高湿度の環境中では、その劣化が大きく経時変
化が生じるので長期の信頼性に欠は安定性に問題があっ
た。However, since these amorphous alloys are easily oxidized, they deteriorate significantly and change over time in environments of high temperature and high humidity, resulting in a lack of long-term reliability and stability problems.
１豆立且１
本発明の目的は、経時変化の少ない長期保存性に優れた
光磁気記録媒体を提供することを目的としている。SUMMARY OF THE INVENTION An object of the present invention is to provide a magneto-optical recording medium that exhibits little change over time and has excellent long-term storage stability.
本発明の光磁気記録媒体は、基板と、希土類金属−遷移
金属合金を主成分としかつ膜面に垂直な方向に一軸磁気
異方性を有する前記基板に担持されたアモルファス合金
膜とからなる光磁気記録媒体であって、前記アモルファ
ス合金膜がＢ（ホウ素）、Ｓｉ（ケイ素）、ＡＩ（アル
ミニウム）。The magneto-optical recording medium of the present invention comprises a substrate and an amorphous alloy film supported on the substrate, which is mainly composed of a rare earth metal-transition metal alloy and has uniaxial magnetic anisotropy in a direction perpendicular to the film surface. In the magnetic recording medium, the amorphous alloy film is made of B (boron), Si (silicon), and AI (aluminum).
Ｇｅ（ゲルマニウム）から選ばれる少なくとも１種類以
上の半金属を添加元素として含むことを特徴とする。It is characterized by containing at least one metalloid selected from Ge (germanium) as an additive element.
友−豊一１
以下、本発明の一実施例を添附図面に基づいて説明する
。Toyoichi Tomo 1 Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.
第１図は本発明の拡大部分断面概略図である。FIG. 1 is an enlarged partial cross-sectional schematic diagram of the present invention.
溝付きＰＭＭＡ基板１の主面上に、アモルファス合金膜
２、保護膜３を順に蒸着あるいはスパッタリング等の方
法により積層し光磁気媒体を作成する。An amorphous alloy film 2 and a protective film 3 are sequentially laminated on the main surface of a grooved PMMA substrate 1 by a method such as vapor deposition or sputtering to create a magneto-optical medium.
本発明によるアモルファス合金における希土類金属Ｒ（
Ｇｄ （ガドリニウム）、Ｔｂ（テルビウム）、Ｄｙ（
ジスプロシウム））と遷移金ａＴ（Ｆｅ（鉄）、Ｃｏ（
−］バルト））との比ＲＴ１−ＸにおけるＸは、従来か
ら適切な値として知られている０、１≦ｘ≦０．４の範
囲の値とする。Rare earth metal R(
Gd (gadolinium), Tb (terbium), Dy (
dysprosium)) and transition gold aT (Fe (iron), Co(
-]Balt)) in the ratio RT1-X is a value in the range of 0, 1≦x≦0.4, which is conventionally known as an appropriate value.
そこへ、半金属のＢ、Ｓｉ、Ａ１．Ｇｅのうち一種類又
は二種類以上の組合せからなる単体又は合金を添加元素
Ｓとして付加する。すなわち、本発明によるアモルファ
ス合金における希土類金属−遷移金属と半金属との原子
比（ＲＴ） １ 、Ｓｙにおけるｙは、０．００５〜０
．４の範囲の値とする。実験結果によると、ｙが０．０
０５以下の半金属の希土類金属−遷移金属への添加は、
記録膜の経時変化を少なくする効果を示さない。また、
ｙが０．４以上になると記録膜の磁気的特性における飽
和磁化ＭＳ、保磁力Ｈｃの劣化が生じ、光磁気記録媒体
として使用することが不可能となる。There, semimetals B, Si, A1. A simple substance or an alloy consisting of one type or a combination of two or more types of Ge is added as the additive element S. That is, in the amorphous alloy according to the present invention, the atomic ratio (RT) of the rare earth metal-transition metal to the metalloid is 1, and y in Sy is 0.005 to 0.
．． The value is in the range of 4. According to the experimental results, y is 0.0
The addition of metalloids below 05 to rare earth metals-transition metals is
It does not show the effect of reducing the aging of the recording film. Also,
When y becomes 0.4 or more, saturation magnetization MS and coercive force Hc in the magnetic properties of the recording film deteriorate, making it impossible to use it as a magneto-optical recording medium.
第２図は、本実施例の光磁気記録媒体と従来のものとに
ついて、室温４５℃湿度９０％の状態で波長６３３ｎｍ
の偏光レーザ光によって再生した場合における反射光の
カー回転角（θｋ” ）の経時変化を調べた結果を示す
グラフである。第２図において、グラフ縦軸にカー回転
角を示しグラフ横軸に時間経過を示し、曲線Ａ１ないし
曲線Ａ４は本実施例の光磁気記録媒体の経時変化を示し
ておりＡ１はＴｂＦｅＣｏＡ Ｉ Ｓ ｉ合金を、Ａ２
はＴｂＦｅＣｏＢ５ ｉ合金を、Ａ３はＧｄＴｂＦｅＣ
ｏＡ １合金を、Ａ４はＴｂＤｙＦｅＣｏＧｅ合金を各
々を別個に記録膜として用いたちの示し、曲線Ｂは従来
のＧｄＴｂＦｅＣｏ合金を用いた光磁気記録媒体の経時
変化を示している。グラフに示す如く本実施例の光記録
媒体はいずれも従来のものよりもカー回転角の減少が少
ないことが分る。Figure 2 shows the magneto-optical recording medium of this embodiment and the conventional one at a wavelength of 633 nm at a room temperature of 45°C and a humidity of 90%.
2 is a graph showing the results of examining changes over time in the Kerr rotation angle (θk") of reflected light when reproduced with a polarized laser beam. In FIG. 2, the vertical axis of the graph represents the Kerr rotation angle, and the horizontal axis of the graph represents the Kerr rotation angle. Curves A1 to A4 show the changes over time of the magneto-optical recording medium of this example.
is TbFeCoB5 i alloy, A3 is GdTbFeC
Curve B shows the change over time of a magneto-optical recording medium using the conventional GdTbFeCo alloy. As shown in the graph, it can be seen that the Kerr rotation angle decreases less in all of the optical recording media of this example than in the conventional ones.
上記実施例では、溝付き基板に直接アモルファス合金膜
を付けたものを示したが基板とアモルファス合金膜の間
にさらに保護膜を設けても良い。In the above embodiment, the amorphous alloy film is directly attached to the grooved substrate, but a protective film may be further provided between the substrate and the amorphous alloy film.
このように保護膜を設けることにより、さらに経時変化
を押えることができる。By providing a protective film in this manner, changes over time can be further suppressed.
発明の効果
以上の如く本発明によれば、希土類金属−遷移金屑含金
に添加元素としてＢ、Ｓｉ、Ａｌ、Ｇｅのうちの一種類
あるいは二種類以上の組合せからなる単体又は合金を添
加することにより酸化が少なくなる故に経時変化の少な
い長期保存性に優れた光磁気記録媒体を得ることができ
る。Effects of the Invention As described above, according to the present invention, a simple substance or an alloy consisting of one or a combination of two or more of B, Si, Al, and Ge is added as an additive element to rare earth metal-transition gold scrap metal. As a result, since oxidation is reduced, it is possible to obtain a magneto-optical recording medium which shows little change over time and has excellent long-term storage stability.
第１図は本発明による光磁気記録媒体の概略断面図であ
り、第２図は従来の光記録媒体と本発明にの光記録媒体
との室温４５℃湿度９０％の状態におけるカー回転角の
経時変化を示すグラフである。
主要部分の符号の説明
１・・・・・・溝付きＰＭＭＡ基板
２・・・・・・アモルファス合金膜
３・・・・・・保護膜FIG. 1 is a schematic cross-sectional view of a magneto-optical recording medium according to the present invention, and FIG. 2 is a diagram showing the Kerr rotation angle of a conventional optical recording medium and an optical recording medium according to the present invention at a room temperature of 45° C. and a humidity of 90%. It is a graph showing changes over time. Explanation of symbols of main parts 1...Grooved PMMA substrate 2...Amorphous alloy film 3...Protective film
Claims (2)
かつ膜面に垂直な方向に一軸磁気異方性を有する前記基
板に担持されたアモルファス合金膜とからなる光磁気記
録媒体であつて、前記アモルファス合金膜がＢ、Ｓｉ、
Ａｌ、Ｇｅから選ばれる少なくとも１種類以上の半金属
を添加元素として含むことを特徴とする光磁気記録媒体
。(1) A magneto-optical recording medium comprising a substrate and an amorphous alloy film supported on the substrate, the main component of which is a rare earth metal-transition metal alloy and which has uniaxial magnetic anisotropy in a direction perpendicular to the film surface. , the amorphous alloy film is made of B, Si,
A magneto-optical recording medium characterized by containing at least one metalloid selected from Al and Ge as an additive element.
＿１＿−＿ｘ）＿１＿−＿ｙＳ＿ｙで示される多元合金
膜であり、ＲはＧｄ、Ｔｂ、Ｄｙから選ばれる１種類以
上の希土類金属であり、ＴはＦｅ、Ｃｏから選ばれる１
種類以上の遷移金属であり、ＳはＢ、Ｓｉ、Ａｌ、Ｇｅ
から選ばれる１種類以上の半金属であり、かつ原子比に
てｘ及びｙは０．１≦ｘ≦０．４及び０．００５≦ｙ≦
０．４の各々の範囲にある値である合金からなることを
特徴とする特許請求の範囲第１項記載の光磁気記録媒体
。(2) The amorphous alloy film has a general formula (R_xT
_1_-_x)_1_-_yS_y is a multi-component alloy film, where R is one or more rare earth metals selected from Gd, Tb, and Dy, and T is 1 selected from Fe and Co.
More than one type of transition metal, S is B, Si, Al, Ge
one or more metalloids selected from
2. The magneto-optical recording medium according to claim 1, wherein the magneto-optical recording medium is made of an alloy having a value in each range of 0.4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8728985A JPS61246946A (en) | 1985-04-23 | 1985-04-23 | Photomagnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8728985A JPS61246946A (en) | 1985-04-23 | 1985-04-23 | Photomagnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61246946A true JPS61246946A (en) | 1986-11-04 |
Family
ID=13910640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8728985A Pending JPS61246946A (en) | 1985-04-23 | 1985-04-23 | Photomagnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61246946A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS621151A (en) * | 1985-06-26 | 1987-01-07 | Ricoh Co Ltd | Photomagnetic recording medium |
| JPS62132254A (en) * | 1985-12-05 | 1987-06-15 | Hitachi Maxell Ltd | Photomagnetic recording medium |
| JPS62154346A (en) * | 1985-12-27 | 1987-07-09 | Hitachi Maxell Ltd | Photomagnetic recording medium |
| JPS62214537A (en) * | 1986-03-14 | 1987-09-21 | Seiko Epson Corp | Photomagnetic recording medium |
| JPS62226450A (en) * | 1986-03-27 | 1987-10-05 | Seiko Epson Corp | Photomagnetic recording medium |
| JPH0224853A (en) * | 1988-07-13 | 1990-01-26 | Matsushita Electric Ind Co Ltd | Magneto-optical recording medium |
| US6324127B1 (en) | 1996-01-18 | 2001-11-27 | Samsung Electronics Co., Ltd. | Magneto-optical recording layer having double-layer structure and magneto-optical disk adopting the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59103314A (en) * | 1982-12-03 | 1984-06-14 | Seiko Instr & Electronics Ltd | Photomagnetic recording medium |
| JPS59168953A (en) * | 1983-03-16 | 1984-09-22 | Canon Inc | Opto-thermo-magnetic recording medium |
| JPS607633A (en) * | 1983-06-24 | 1985-01-16 | Canon Inc | Photothermomagnetic recording medium |
-
1985
- 1985-04-23 JP JP8728985A patent/JPS61246946A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59103314A (en) * | 1982-12-03 | 1984-06-14 | Seiko Instr & Electronics Ltd | Photomagnetic recording medium |
| JPS59168953A (en) * | 1983-03-16 | 1984-09-22 | Canon Inc | Opto-thermo-magnetic recording medium |
| JPS607633A (en) * | 1983-06-24 | 1985-01-16 | Canon Inc | Photothermomagnetic recording medium |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS621151A (en) * | 1985-06-26 | 1987-01-07 | Ricoh Co Ltd | Photomagnetic recording medium |
| JPS62132254A (en) * | 1985-12-05 | 1987-06-15 | Hitachi Maxell Ltd | Photomagnetic recording medium |
| JPS62154346A (en) * | 1985-12-27 | 1987-07-09 | Hitachi Maxell Ltd | Photomagnetic recording medium |
| JP2587408B2 (en) * | 1985-12-27 | 1997-03-05 | 日立マクセル株式会社 | Magneto-optical recording medium |
| JPS62214537A (en) * | 1986-03-14 | 1987-09-21 | Seiko Epson Corp | Photomagnetic recording medium |
| JPS62226450A (en) * | 1986-03-27 | 1987-10-05 | Seiko Epson Corp | Photomagnetic recording medium |
| JPH0224853A (en) * | 1988-07-13 | 1990-01-26 | Matsushita Electric Ind Co Ltd | Magneto-optical recording medium |
| US6324127B1 (en) | 1996-01-18 | 2001-11-27 | Samsung Electronics Co., Ltd. | Magneto-optical recording layer having double-layer structure and magneto-optical disk adopting the same |
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