发明授权
- 专利标题: Magneto-optical recording device using light-modulated technic without an initial magnetic field
- 专利标题(中): 使用没有初始磁场的光调制技术的磁光记录装置
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申请号: US744565申请日: 1996-11-06
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公开(公告)号: US5691963A公开(公告)日: 1997-11-25
- 发明人: Junji Hirokane , Hiroyuki Katayama , Akira Takahashi , Kenji Ohta
- 申请人: Junji Hirokane , Hiroyuki Katayama , 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: JPX5-001375 19930107
- 主分类号: G11B11/10
- IPC分类号: G11B11/10 ; G11B11/105 ; G11B11/00
摘要:
A magneto-optical recording medium including a base; a readout layer formed on the base; a recording layer formed on the readout layer; and an auxiliary recording layer formed on the recording layer, each of the readout layer, recording layer and auxiliary recording layer being made of an alloy of rare-earth metal and transition metal showing ferrimagnetism. The alloy composition of each layer is determined so that the recording layer has a Curie temperature lower than Curie temperatures of the readout layer and the auxiliary recording layer and has a coercive force higher than coercive forces of the readout layer and the auxiliary recording layer at room temperature and that, when the temperature of the recording layer is raised to near its Curie temperature while perpendicularly applying a uniform recording magnetic field to each layer, a sublattice magnetic moment of the rare-earth metal of the readout layer and a sublattice magnetic moment of the rare-earth metal of the auxiliary recording layer are antiparallel to each other. And, a method of recording information on the magneto-optical recording medium. This structure enables overwriting by light-intensity modulation without using an initializing magnetic field.