发明授权
- 专利标题: Magneto-optical recording medium having a readout layer with varying composition and curie temperature
- 专利标题(中): 磁光记录介质具有不同组成和居里温度的读出层
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申请号: US350317申请日: 1994-12-05
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公开(公告)号: US5563852A公开(公告)日: 1996-10-08
- 发明人: Yoshiteru Murakami , Naoyasu Iketani , Akira Takahashi , Kenji Ohta
- 申请人: Yoshiteru Murakami , Naoyasu Iketani , Akira Takahashi , Kenji Ohta
- 申请人地址: JPX Osaka
- 专利权人: Sharp Kabushiki Kaisha
- 当前专利权人: Sharp Kabushiki Kaisha
- 当前专利权人地址: JPX Osaka
- 优先权: JPX5-305136 19931206
- 主分类号: C23C14/18
- IPC分类号: C23C14/18 ; C23C14/34 ; C23C14/56 ; G11B11/105 ; G11B5/66
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.
公开/授权文献
- US4907966A Impression tray for retention of impression material 公开/授权日:1990-03-13
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