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    • 11. 发明授权
    • Overwrite capable magneto-optical recording medium having three
magneto-optic layers
    • 具有三个磁光层的具有覆盖能力的磁光记录介质
    • US5536570A
    • 1996-07-16
    • US411921
    • 1995-03-28
    • Yoichi Osato
    • Yoichi Osato
    • G11B11/10G11B11/105G11B5/66B32B5/16
    • G11B11/10586G11B11/10506G11B11/10521Y10S428/90Y10T428/265
    • A magneto-optical recording medium capable of overwriting by light modulation comprises a substrate, a first magnetic layer having a curie point T.sub.1 and a coercive force H.sub.1, a second magnetic layer having a curie point T.sub.2 and a coercive force H.sub.2, and a third magnetic layer having a curie point T.sub.3 and a coercive force H.sub.3. The first, second and third magnetic layers are successively laminated on the substrate. The first magnetic layer, the second magnetic layer and the third magnetic layer each are vertically magnetized film composed chiefly of an amorphous alloy of rare earth elements and transition metal elements, and satisfy the following conditions:H.sub.1 >H.sub.2 >H.sub.3,T.sub.1 >T.sub.2 and T.sub.3.By constituting the magneto-optical recording medium as above, the external magnetic field can be reduced to thereby prevent the disappearance of the recording bit and to enable the compactness of a recording apparatus to be accomplished.
    • 能够通过光调制重写的磁光记录介质包括基板,具有居里点T1和矫顽力H1的第一磁性层,具有居里点T2和矫顽力H2的第二磁性层和第三磁性层 具有居里点T3和矫顽力H3的层。 第一,第二和第三磁性层依次层压在基板上。 第一磁性层,第二磁性层和第三磁性层各自是主要由稀土元素和过渡金属元素的非晶态合金构成的垂直磁化膜,满足以下条件:H1> H2> H3,T1> T2和 T3。 通过如上所述构成磁光记录介质,可以减小外部磁场,从而防止记录位的消失,并且能够实现记录装置的紧凑性。