发明授权
US5233578A Method of recording information on a recording medium having at least
two magnetic layers
失效
在具有至少两个磁性层的记录介质上记录信息的方法
- 专利标题: Method of recording information on a recording medium having at least two magnetic layers
- 专利标题(中): 在具有至少两个磁性层的记录介质上记录信息的方法
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申请号: US979459申请日: 1992-11-20
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公开(公告)号: US5233578A公开(公告)日: 1993-08-03
- 发明人: Masakuni Yamamoto , Koyo Hasegawa , Yasuyuki Miyaoka , Yutaka Ogasawara , Makoto Hiramatsu , Susumu Matsumura
- 申请人: Masakuni Yamamoto , Koyo Hasegawa , Yasuyuki Miyaoka , Yutaka Ogasawara , Makoto Hiramatsu , Susumu Matsumura
- 申请人地址: JPX Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX63-332624 19881228; JPX1-8552 19890119
- 主分类号: G11B7/135
- IPC分类号: G11B7/135 ; G11B11/105
摘要:
Disclosed is a method of recording information on a magnetooptical recording medium, which medium includes a first magnetic layer and a second magnetic layer having a lower Curie temperature and a higher coercive force at room temperature than those of the first magnetic layer. The second magnetic layer is exchange-coupled to the first magnetic layer. The first magnetic layer has a higher compensation temperature than the Curie temperature of the second magnetic layer. The method of recording information includes applying a magnetic field, which is modified in accordance with information from a magnetic head, to the medium to record information on the first magnetic layer and scanning the medium with a light beam to heat the medium to a temperature at least near the Curie temperature of the second magnetic layer so as to transfer the information recorded on the first magnetic layer to the second magnetic layer.
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