发明授权
- 专利标题: Magneto-optical recording medium having a plurality of magnetic layers
- 专利标题(中): 具有多个磁性层的磁光记录介质
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申请号: US803274申请日: 1997-02-20
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公开(公告)号: US5768218A公开(公告)日: 1998-06-16
- 发明人: Junichiro Nakayama , Yoshiteru Murakami , Junji Hirokane , Akira Takahashi
- 申请人: Junichiro Nakayama , Yoshiteru Murakami , Junji Hirokane , Akira Takahashi
- 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: JPX8-034689 19960222
- 主分类号: G11B11/10
- IPC分类号: G11B11/10 ; G11B11/105 ; G11B11/00
摘要:
A magneto-optical recording medium has a transparent substrate, a first magnetic layer, first intermediate layer, a second magnetic layer, and a third magnetic layer provided in this order. The first magnetic layer has an in-plane magnetization at room temperature, while a transition from the in-plane magnetization to a perpendicular magnetization occurs to the first magnetic layer with a temperature rise. The first intermediate layer is made of a non-magnetic substance. The second magnetic layer is a film having a perpendicular magnetization. The third magnetic layer is a film having a perpendicular magnetization, has a coercive force smaller than that of the second magnetic layer at room temperature, and has a Curie temperature higher than that of the second magnetic layer. The light intensity modulation overwriting method is applicable to the magneto-optical recording medium thus arranged, superior reproduction signal characteristics can be obtained with respect to this magneto-optical recording medium, and reproduction can be carried out with respect to the recording medium even though it has recording bits whose each diameter is smaller than that of a light beam. Thus it is possible to provide the magneto-optical recording medium suitable for high density recording.
公开/授权文献
- US5214225A Dehydrogenation process with improved heat recovery 公开/授权日:1993-05-25