公开(公告)号：EP0440486A3

公开(公告)日：1992-01-22

申请号：EP91300795.1

申请日：1991-01-31

申请人： KABUSHIKI KAISHA TOSHIBA

发明人： Ichihara, Katsutaro, c/o Intell. Property Div. ,  Ashida, Sumio, c/o Intellectual Property Div. ,  Kikitsu, Akira, c/o Intellectual Property Div. ,  Mizusawa, Yumi, c/o Intellectual Property Div.

IPC分类号： G11B11/10

CPC分类号： G11B11/10521 ,  G11B11/10586

摘要： Light beams having two different power levels are radiated on a magneto-optical medium having a recording layer (1) and a bias layer (2) magnetostatically coupled to the recording layer (1), thereby recording and erasing information. Upon radiation of a high level beam, a beam irradiated portion of the recording layer (1) is heated to reach a magnetization reversal temperature, and the direction of magnetization of the irradiated portion follows a direction of a leakage field generated by a magnetization distribution formed by heating of the bias layer (2). Upon radiation of a low level beam, a beam irradiated portion of the recording layer (1) is heated to reach a magnetization reversal temperature to cause the bias layer (2) to generate a leakage field having a magnitude smaller than that upon radiation of the high level beam. In this case, the direction of magnetization of the recording layer (1) is opposite to that of the leakage field obtained upon radiation of the high level beam. The directions of magnetization of the bias layer (2) are kept unchanged before and after the radiation of the high level beam and before and after the radiation of the low level beam.

公开(公告)号：EP0440486B1

公开(公告)日：1997-05-07

申请号：EP91300795.1

申请日：1991-01-31

申请人： KABUSHIKI KAISHA TOSHIBA

发明人： Ichihara, Katsutaro, c/o Intell. Property Div. ,  Ashida, Sumio, c/o Intellectual Property Div. ,  Kikitsu, Akira, c/o Intellectual Property Div. ,  Mizusawa, Yumi, c/o Intellectual Property Div.

IPC分类号： G11B11/10

CPC分类号： G11B11/10521 ,  G11B11/10586

公开(公告)号：EP0440486A2

公开(公告)日：1991-08-07

申请号：EP91300795.1

申请日：1991-01-31

申请人： KABUSHIKI KAISHA TOSHIBA

发明人： Ichihara, Katsutaro, c/o Intell. Property Div. ,  Ashida, Sumio, c/o Intellectual Property Div. ,  Kikitsu, Akira, c/o Intellectual Property Div. ,  Mizusawa, Yumi, c/o Intellectual Property Div.

IPC分类号： G11B11/10

CPC分类号： G11B11/10521 ,  G11B11/10586

摘要： Light beams having two different power levels are radiated on a magneto-optical medium having a recording layer (1) and a bias layer (2) magnetostatically coupled to the recording layer (1), thereby recording and erasing information. Upon radiation of a high level beam, a beam irradiated portion of the recording layer (1) is heated to reach a magnetization reversal temperature, and the direction of magnetization of the irradiated portion follows a direction of a leakage field generated by a magnetization distribution formed by heating of the bias layer (2). Upon radiation of a low level beam, a beam irradiated portion of the recording layer (1) is heated to reach a magnetization reversal temperature to cause the bias layer (2) to generate a leakage field having a magnitude smaller than that upon radiation of the high level beam. In this case, the direction of magnetization of the recording layer (1) is opposite to that of the leakage field obtained upon radiation of the high level beam. The directions of magnetization of the bias layer (2) are kept unchanged before and after the radiation of the high level beam and before and after the radiation of the low level beam.

摘要翻译： 具有两个不同功率电平的光束被辐射在具有静磁耦合到记录层（1）的记录层（1）和偏置层（2）的磁光介质上，从而记录和擦除信息。 在高电平光束的照射下，加热记录层（1）的光束照射部分以达到磁化反转温度，并且照射部分的磁化方向遵循由形成的磁化分布产生的泄漏场的方向 通过加热偏压层（2）。 在低电平光束的辐射下，加热记录层（1）的光束照射部分以达到磁化反转温度，以使偏压层（2）产生的幅度小于 高级梁。 在这种情况下，记录层（1）的磁化方向与通过高电平光束的辐射获得的泄漏场的方向相反。 偏置层（2）的磁化方向在高电平光束的辐射之前和之后以及在低电平光束的辐射之前和之后保持不变。