发明公开
EP0657880A3 Magneto-optical recording medium and manufacturing method thereof
失效
Magnetooptisches Aufzeichnungsmedium und Verfahren zu seiner Herstellung。
- 专利标题: Magneto-optical recording medium and manufacturing method thereof
- 专利标题(中): Magnetooptisches Aufzeichnungsmedium und Verfahren zu seiner Herstellung。
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申请号: EP94309031.6申请日: 1994-12-05
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公开(公告)号: EP0657880A3公开(公告)日: 1995-09-20
- 发明人: Murakami, Yoshiteru , Takahashi, Akira , Iketani, Naoyasu , Ohta, Kenji
- 申请人: SHARP KABUSHIKI KAISHA
- 申请人地址: 22-22 Nagaike-cho Abeno-ku Osaka 545 JP
- 专利权人: SHARP KABUSHIKI KAISHA
- 当前专利权人: SHARP KABUSHIKI KAISHA
- 当前专利权人地址: 22-22 Nagaike-cho Abeno-ku Osaka 545 JP
- 代理机构: Brown, Kenneth Richard
- 优先权: JP305136/93 19931206
- 主分类号: G11B11/10
- IPC分类号: G11B11/10
摘要:
A magneto-optical recording medium includes a readout layer has in-plane magnetization at room temperature and in which a transition occurs from in-plane magnetization to perpendicular magnetization when temperature thereof is raised, and a recording layer for recording thereon information. The composition of the readout layer varies in a direction perpendicular to the surface thereof, and in the readout layer, the Co density on the light incident side is higher than the Co density on the interface between the readout layer and the recording layer. Therefore, the Curie temperature on the reproducing light incident side of the readout layer is high and the the polar Kerr rotation angle in reproducing increases, thereby achieving improvements in a reproducing signal quality. On the other hand, since the Curie temperature on the interface is low, the shift of the threshold temperature at which a transition occurs from in-plane to perpendicular by the magnetic interaction between the layers can be suppressed, thereby achieving a high quality reproducing signal without changing the laser power required for reproduction very much.
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