Title:
【発明の名称】短波長領域で大きいカー回転角を有する光磁気記録メディア
Document Type and Number:
Japanese Patent JP3199179
Kind Code:
B2
Abstract:
A magnetooptical recording medium comprises a transparent substrate (10), on which are sequentially laminated a protective film (14); a first magnetic film (11) made of a light rare earth metal, heavy rare earth metal, and transition metal alloy; a second magnetic film (12) made of a light rare earth metal, heavy rare earth metal, and transition metal alloy; a third magnetic film (13) made of a light rare earth metal, heavy rare earth metal, and transition metal alloy; a protective film (15); and a reflecting film (16). The sandwich of the first, second and third magnetic layers constitutes a recording film (17). The compositions of the first and third magnetic layers contain a large amount of light rare earth metal and have a large Kerr rotational angle in a single wavelength region (400 nm to 700 nm). On the other hand, the composition of the second magnetic layer contains a large amount of heavy rare earth metal and has a property suitable for vertical magnetization. The recording film (17) consisting of the sandwich of the first, second and third magnetic layers has a large Kerr rotational angle as a whole in a short wavelength region, and has a large coercive force. This recording film (17) is sufficiently thin (below 400 ANGSTROM ). When the three-layered sandwich and the reflecting layer (16) are combined with each other, a further greater Kerr rotational angle can be obtained.
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Inventors:
Hiroshi Miyazawa
Shoji Hoshina
Satoshi Shimokawa
Masaaki Ichikawa
Masaya Ishida
Takeo Kawase
Toshiaki Mikoshiba
Satoshi Nehashi
Tatsuya Shimoda
Shoji Hoshina
Satoshi Shimokawa
Masaaki Ichikawa
Masaya Ishida
Takeo Kawase
Toshiaki Mikoshiba
Satoshi Nehashi
Tatsuya Shimoda
Application Number:
JP50801793A
Publication Date:
August 13, 2001
Filing Date:
November 20, 1992
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
G11B11/105; (IPC1-7): G11B11/105
Domestic Patent References:
| JP1237945A | ||||
| JP2267754A | ||||
| JP528551A | ||||
| JP4150010A |
Other References:
飯寄英保、外１名，“高密度記録用光磁気記録媒体”，電子情報通信学会技術研究報告［磁気記録］，１９９１年 ２月２６日，Ｖｏｌ．９０，Ｎｏ．４５１，ｐ．４１−４６（ＭＲ９０−５８）
Attorney, Agent or Firm:
Kazuo Sato (3 others)