JPH057775B2 - - Google Patents
Info
- Publication number
- JPH057775B2 JPH057775B2 JP15457482A JP15457482A JPH057775B2 JP H057775 B2 JPH057775 B2 JP H057775B2 JP 15457482 A JP15457482 A JP 15457482A JP 15457482 A JP15457482 A JP 15457482A JP H057775 B2 JPH057775 B2 JP H057775B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- magnetic
- magneto
- present
- 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.)
- Expired - Lifetime
Links
- 230000005291 magnetic effect Effects 0.000 claims description 29
- 239000000758 substrate Substances 0.000 claims description 10
- 230000005294 ferromagnetic effect Effects 0.000 claims description 8
- 239000010409 thin film Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 41
- 239000010408 film Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical group [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000003064 anti-oxidating effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
Description
【発明の詳細な説明】
本発明はキユリー温度が250℃以下の強磁性酸
化物からなる磁性薄層を有する光磁気記録媒体に
関する。さらに詳しくは、本発明はレーザー光な
どの光熱によつて情報を書き込み記録できる光磁
気記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magneto-optical recording medium having a magnetic thin layer made of a ferromagnetic oxide having a Curie temperature of 250° C. or less. More specifically, the present invention relates to a magneto-optical recording medium on which information can be written and recorded using light and heat such as laser light.
従来、非晶質磁性層を有する記録媒体を用いて
光磁気記録を行うことが知られている。しかしな
がら、これら非晶質磁性層は酸化され易く酸化さ
れると光磁気特性が劣化するために磁性層を形成
した直後にその上に保護層を設ける必要があるの
で製造上の難点がある。一方、フエライトのよう
な強磁性酸化物は比較的大きな光磁気特性を有す
ることが知られているが光磁気記録に応用するに
は不十分でありしかもキユリー点も高いという問
題があつた。 Conventionally, it has been known to perform magneto-optical recording using a recording medium having an amorphous magnetic layer. However, since these amorphous magnetic layers are easily oxidized and the magneto-optical properties deteriorate when oxidized, it is necessary to provide a protective layer thereon immediately after forming the magnetic layer, which poses manufacturing difficulties. On the other hand, although ferromagnetic oxides such as ferrite are known to have relatively large magneto-optical properties, they are insufficient for application to magneto-optical recording and have the problem of having a high Kyrie point.
本発明は上記問題に鑑みてなされたものであつ
て特定の金属で置換された鉄酸化物を磁性薄層に
用いることにより充分に大きな光磁気特性を有す
る光磁気記録媒体を提供することを目的とする。
また、本発明の別の目的は酸化や腐蝕がなくかつ
磁気特性の劣化がない酸化物磁性膜を提供するこ
とである。さらに、本発明の目的は光磁気記録媒
体の材料としてキユリー温度が250℃以下の酸化
物磁性体を用いることである。 The present invention was made in view of the above problems, and an object of the present invention is to provide a magneto-optical recording medium having sufficiently large magneto-optical properties by using iron oxide substituted with a specific metal in a magnetic thin layer. shall be.
Another object of the present invention is to provide an oxide magnetic film that is free from oxidation and corrosion and free from deterioration of magnetic properties. Furthermore, an object of the present invention is to use an oxide magnetic material having a Curie temperature of 250° C. or lower as a material for a magneto-optical recording medium.
本発明の光磁気記録媒体は、透明基板上に一般
式
BaCoxTiyFe12−pO19
（式中、ｐ＝ｘ＋ｙ、1.2≦ｐ≦２である）で
表わされる強磁性酸化物からなる磁性薄層を設
け、さらにこの磁性薄層上に透明誘電体層および
反射層を順次設けたことを特徴とするものであ
る。 The magneto-optical recording medium of the present invention has a magnetic film made of a ferromagnetic oxide represented by the general formula BaCo x Ti y Fe 12 −pO 19 (where p=x+y, 1.2≦p≦2) on a transparent substrate. It is characterized in that a thin magnetic layer is provided, and a transparent dielectric layer and a reflective layer are sequentially provided on the magnetic thin layer.
次に、本発明を図面を参照しつつ詳細に説明す
る。 Next, the present invention will be explained in detail with reference to the drawings.
第１図に示すように、本発明の光磁気記録媒体
は透明基板１上に磁性薄層２を設け、さらにこの
上に透明誘電体層３および反射層４を順次設けた
ものである。酸化防止層５は必要に応じて設ける
ことができる。透明基板としては、ガラス、石英
ガラス、耐熱性プラスチツクなどを用いることが
できる。基板上の酸化物磁性薄層の厚さは100〜
30000Å程度で好ましくは300〜5000Åである。次
に、この酸化物磁性薄層に屈折率２程度の透明誘
電体層1000〜5000Å程度を形成させる。さらに、
この透明誘電体層上に反射層例えばCu、Au、
Ag、Pt、Alなどを500〜10000Å程度形成させ、
さらに必要に応じてこの上に酸化防止層として
SiO2、TiO2などの酸化物を形成させることがで
きる。 As shown in FIG. 1, the magneto-optical recording medium of the present invention has a magnetic thin layer 2 provided on a transparent substrate 1, and a transparent dielectric layer 3 and a reflective layer 4 provided thereon in this order. The antioxidant layer 5 can be provided as necessary. As the transparent substrate, glass, quartz glass, heat-resistant plastic, etc. can be used. The thickness of the oxide magnetic thin layer on the substrate is 100~
The thickness is about 30,000 Å, preferably 300 to 5,000 Å. Next, a transparent dielectric layer having a refractive index of about 2 and a thickness of about 1000 to 5000 Å is formed on this oxide magnetic thin layer. moreover,
A reflective layer such as Cu, Au, etc. is placed on this transparent dielectric layer.
Ag, Pt, Al, etc. are formed with a thickness of about 500 to 10,000 Å,
Furthermore, if necessary, add an anti-oxidation layer on top of this.
Oxides such as SiO 2 and TiO 2 can be formed.
本発明における酸化物磁性薄層を構成する強磁
性酸化物は一般式
BaCoxTiyFe12−pO19
（式中、各記号の意味は上述したとおりであ
る）で表わされるものであつてキユリー温度が
250℃以下である。一般に酸化物磁性体はキユリ
ー温度が400℃以上と高いことから従来光磁気メ
モリー材料として使用できないとされている。本
発明者は酸化物の組成とキユリー温度との間に特
定の関係があることを見出し酸化物磁性体の光磁
気記録媒体への利用を可能にしたのである。ここ
で本発明において用いられる代表的な強磁性酸化
物を例にとつてその組成とキユリー温度との関係
を説明すれば第２図に示したようになる。例え
ば、垂直異方性六方晶バリウムフエライト酸化磁
性体であるBaCoxTiyFe12-pO19ではｘ＝０のとき
はキユリー温度が450℃となるがFe原子を特定の
金属で置換するとつまりｘ成分量に応じてキユリ
ー温度が低下することが明らかである。また、こ
のようにキユリー温度の低い酸化物磁性体でも磁
気光学効果が回転性能を十分維持しており、大き
いカー回転角（2θk）が得られる。本発明の磁性
薄層は上記のようなキユリー温度の低い強磁性酸
化物をスパツタリング法、蒸着法、イオンプレー
テイング法などによつて透明基板上に形成して得
られる。 The ferromagnetic oxide constituting the oxide magnetic thin layer in the present invention is represented by the general formula BaCo x Ti y Fe 12 −pO 19 (in the formula, the meaning of each symbol is as described above), and is temperature
The temperature is below 250℃. In general, oxide magnetic materials have a high Curie temperature of 400°C or higher, so it has been said that they cannot be used as magneto-optical memory materials. The present inventor discovered that there is a specific relationship between the composition of an oxide and the Curie temperature, making it possible to use oxide magnetic materials in magneto-optical recording media. Taking a typical ferromagnetic oxide used in the present invention as an example, the relationship between its composition and its Curie temperature will be explained as shown in FIG. 2. For example, in BaCo x Ti y Fe 12-p O 19 , which is a perpendicularly anisotropic hexagonal barium ferrite oxide magnetic material, the Curie temperature is 450°C when x = 0, but if the Fe atom is replaced with a specific metal, It is clear that the Curie temperature decreases depending on the amount of the x component. Furthermore, even with such a low Curie temperature oxide magnetic material, the magneto-optic effect sufficiently maintains rotation performance, and a large Kerr rotation angle (2θk) can be obtained. The magnetic thin layer of the present invention is obtained by forming the above-described ferromagnetic oxide having a low Curie temperature on a transparent substrate by sputtering, vapor deposition, ion plating, or the like.
さらに、本発明の特徴は充分なカー回転角を得
るために酸化物磁性薄層上に透明誘電体層を設け
ることである。ここで膜の構成とカー回転角との
関係を図面について説明すると、第３図Ａおよび
Ｂは従来の構成を示すものであつてＡは（ガラ
ス）基板１上に磁性層２（膜厚4000Å）を設けた
例を示しそしてＢは基板１上に磁性層２（膜厚
200Å）および反射層４を順次設けた例を示す。
第１図に示すように磁性層２（膜厚300Å）上に
透明誘電体層３を設けた本発明のもの（以下、Ｃ
を略記する）比較する。Ａ，ＢおよびＣのいずれ
の場合においてもカー回転角の測定は基板側から
行つた。第４図は膜の構成とカー回転角との関係
を示したものであつて、Ａは磁性層が厚い場合で
媒体表面からの反射のみのカー回転角であり、Ｂ
は磁性層は薄膜で光透過可能で反射層で光が反射
されるので回転角が増大する。そしてＣはＢにさ
らに誘電体層を設けたものであつて磁性層との相
互作用により反射光が小さくなり結果としてカー
回転角が増大する。上述したように、本発明では
透明誘電体層を設けることによりカー回転角が増
大する。 Furthermore, a feature of the present invention is that a transparent dielectric layer is provided on the oxide magnetic thin layer in order to obtain a sufficient Kerr rotation angle. To explain the relationship between the structure of the film and the Kerr rotation angle with reference to the drawings, FIGS. 3A and 3B show the conventional structure. ) is shown, and B shows an example in which a magnetic layer 2 (film thickness) is provided on the substrate 1.
200 Å) and a reflective layer 4 are sequentially provided.
As shown in FIG. 1, the present invention (hereinafter referred to as C
(abbreviated)) Compare. In all cases A, B, and C, the Kerr rotation angle was measured from the substrate side. Figure 4 shows the relationship between the film structure and the Kerr rotation angle, where A is the Kerr rotation angle for only reflection from the medium surface when the magnetic layer is thick, and B is the Kerr rotation angle for only reflection from the medium surface.
The magnetic layer is a thin film that allows light to pass through, and the light is reflected by the reflective layer, increasing the rotation angle. C is a structure in which a dielectric layer is further provided on B, and the reflected light becomes smaller due to interaction with the magnetic layer, and as a result, the Kerr rotation angle increases. As described above, in the present invention, the Kerr rotation angle is increased by providing a transparent dielectric layer.
以下に実施例を掲げて本発明をさらに詳しく説
明するが、本発明はここに例示の実施例に限定さ
れるものではない。 The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to the Examples illustrated here.
実施例
BaCoxTiｙFe12-pO19（1.2≦ｐ≦２）の微粉末
を焼結して直径５cm、厚さ１mmのターゲツトを作
成した。次に、ガラス基板上に総ガス圧
60mTorrおよび酸素分圧0.3mTorrで膜作製速度
を25Å／分にしてスパツタリングによつて膜厚
500Åの磁性薄層を得た。この磁性薄層上に、膜
厚2000〜3000ÅのSiO2透明誘電体層、膜厚3000
ÅのCu反射層および膜厚2000ÅのSiO2酸化防止
層をスパツタリングによつて順次積層させた。Example A target having a diameter of 5 cm and a thickness of 1 mm was prepared by sintering fine powder of BaCo x TiyFe 12-p O 19 (1.2≦p≦2). Next, the total gas pressure on the glass substrate
The film thickness was measured by sputtering at a film formation rate of 25 Å/min at 60 mTorr and oxygen partial pressure of 0.3 mTorr.
A magnetic thin layer of 500 Å was obtained. On this magnetic thin layer, a SiO 2 transparent dielectric layer with a film thickness of 2000 to 3000 Å is applied.
A Cu reflective layer with a thickness of 2000 Å and an SiO 2 oxidation prevention layer with a thickness of 2000 Å were sequentially laminated by sputtering.
このようにして作成した記録媒体を１方向に磁
化させ、次にこの１部に磁化の方向と逆の磁界を
0.3KOe〜1KOe印加しながら、レーザー出力
10mW、媒体面約5mWの800nmの半導体レーザ
ーを5μsパルス照射して磁化反転させた。これに
レーザーを媒体面に0.5〜2mW程度照射させ、媒
体面よりもどつた光のカー回転角を測定した。
2θkは1.2〜2.0゜であつた。ｘ＝1.2の組成の時に
2θkはピークの値で示した。 The recording medium created in this way is magnetized in one direction, and then a magnetic field opposite to the direction of magnetization is applied to this part.
Laser output while applying 0.3KOe~1KOe
The magnetization was reversed by irradiating a 5 μs pulse with an 800 nm semiconductor laser at 10 mW and about 5 mW on the medium surface. A laser beam of about 0.5 to 2 mW was applied to the medium surface, and the Kerr rotation angle of the light reflected from the medium surface was measured.
2θk was 1.2-2.0°. When the composition is x=1.2
2θk is shown as the peak value.
この記録媒体の磁性薄層は100℃で７日間保存
後も磁気特性の劣化はなかつた。これに対しアモ
ルフアス磁性合金膜（Tb0.24Fe0.76：1000Å厚）
は酸化および結晶化が起り磁気特性が著しく低化
した。 The magnetic thin layer of this recording medium showed no deterioration in magnetic properties even after being stored at 100°C for 7 days. On the other hand, amorphous magnetic alloy film (Tb 0.24 Fe 0.76 : 1000Å thick)
oxidation and crystallization occurred, and the magnetic properties were significantly deteriorated.
第１図は本発明の光磁気記録媒体の構成例を示
す断面図であり、第２図は強磁性酸化物の組成と
キユリー温度との関係を示すグラフであり、第３
図は従来の光磁気記録媒体の構成例を示す断面図
であり、そして第４図は光磁気記録媒体の構成と
カー回転角との関係を示すグラフである。
１……透明基板、２……磁性薄層、３……透明
誘電体層、４……反射層、５……酸化防止層。
FIG. 1 is a cross-sectional view showing an example of the structure of the magneto-optical recording medium of the present invention, FIG. 2 is a graph showing the relationship between the composition of a ferromagnetic oxide and the Curie temperature, and FIG.
This figure is a sectional view showing an example of the structure of a conventional magneto-optical recording medium, and FIG. 4 is a graph showing the relationship between the structure of the magneto-optical recording medium and the Kerr rotation angle. DESCRIPTION OF SYMBOLS 1... Transparent substrate, 2... Magnetic thin layer, 3... Transparent dielectric layer, 4... Reflective layer, 5... Anti-oxidation layer.
Claims (1)
表わされる強磁性酸化物からなる磁性薄層を設
け、さらにこの磁性薄層上に透明誘電体層および
反射層を順次設けたことを特徴とする、光磁気記
録媒体。[Claims] 1. A magnetic thin film made of a ferromagnetic oxide represented by the general formula BaCo x Ti y Fe 12 −pO 19 (where p=x+y, 1.2≦p≦2) on a transparent substrate. 1. A magneto-optical recording medium, characterized in that a layer is provided, and a transparent dielectric layer and a reflective layer are sequentially provided on the magnetic thin layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15457482A JPS5945644A (en) | 1982-09-07 | 1982-09-07 | Photomagnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15457482A JPS5945644A (en) | 1982-09-07 | 1982-09-07 | Photomagnetic recording medium |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23896592A Division JPH0777043B2 (en) | 1992-08-13 | 1992-08-13 | Magneto-optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5945644A JPS5945644A (en) | 1984-03-14 |
| JPH057775B2 true JPH057775B2 (en) | 1993-01-29 |
Family
ID=15587198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15457482A Granted JPS5945644A (en) | 1982-09-07 | 1982-09-07 | Photomagnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5945644A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0664762B2 (en) * | 1984-06-11 | 1994-08-22 | 株式会社リコー | Magneto-optical recording medium |
| JPH0719400B2 (en) * | 1984-07-21 | 1995-03-06 | 株式会社リコー | Magneto-optical recording medium |
| US4690861A (en) * | 1985-03-11 | 1987-09-01 | Ricoh Co., Ltd. | Magneto optical recording medium |
| JPH0740380B2 (en) * | 1985-11-19 | 1995-05-01 | 株式会社リコー | Magneto-optical recording material |
| JPH02165447A (en) * | 1988-12-16 | 1990-06-26 | Matsushita Electric Ind Co Ltd | Magneto-optical recording medium and production thereof |
-
1982
- 1982-09-07 JP JP15457482A patent/JPS5945644A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5945644A (en) | 1984-03-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4544602A (en) | Magneto-optical recording medium having a ferrimagnetic recording layer | |
| JPH0413779B2 (en) | ||
| JPS59188106A (en) | Photo-magnetic recording medium | |
| JPH057775B2 (en) | ||
| JPH06120029A (en) | Vertically magnetized film, multilayer film for vertically magnetized film and manufacturing method of the same | |
| JP2701337B2 (en) | Magneto-optical recording medium | |
| JPH0519213B2 (en) | ||
| JP2526615B2 (en) | Magneto-optical recording medium | |
| JPS62192944A (en) | Optical recording medium | |
| JP2729962B2 (en) | Magneto-optical recording medium | |
| JPH0777043B2 (en) | Magneto-optical recording medium | |
| JPH0583971B2 (en) | ||
| JPH0660452A (en) | Magneto-optical recording medium | |
| JP2544684B2 (en) | Magneto-optical recording medium | |
| JPH03157838A (en) | Magneto-optical recording device | |
| JP2503268B2 (en) | Magneto-optical recording medium and manufacturing method thereof | |
| JPS6189604A (en) | Metal oxide magnetic substance and magnetic film | |
| JP2654676B2 (en) | Magneto-optical recording element | |
| JPH01162257A (en) | Magneto-optical recording medium | |
| JP2612215B2 (en) | Magneto-optical recording medium | |
| JPS63276728A (en) | Magneto-optical recording medium | |
| JPS6189605A (en) | Metal oxide magnetic substance and magnetic film | |
| JPH056584A (en) | Magneto-optical recording medium | |
| JPH01102757A (en) | Magneto-optical recording medium | |
| JPS59171054A (en) | Magneto-optical storage element |