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    • 6. 发明授权
    • Magneto-optical recording medium and reproducing method for reproducing magnetic domain in enlarged form on a reproducing layer
    • 磁光记录介质和再现方法,用于在再现层上以放大形式再现磁畴
    • US06385140B2
    • 2002-05-07
    • US09799602
    • 2001-03-07
    • Satoru OhnukiNorio OhtaKatsusuke ShimazakiMasafumi YoshihiroHiroki TakaoHitoshi Watanabe
    • Satoru OhnukiNorio OhtaKatsusuke ShimazakiMasafumi YoshihiroHiroki TakaoHitoshi Watanabe
    • G11B1100
    • G11B11/10515G11B11/10584G11B11/10593
    • A magneto-optic recording medium includes a second auxiliary magnetic film, a first auxiliary magnetic film and a magneto-optic recording film on a substrate. The auxiliary magnetic films change from in-plane magnetization to vertical magnetization at critical temperatures TCR1 and TCR2. Since they have the relation TCR1>TCR2, the magnetic domain transferred from the magneto-optic recording film to the first auxiliary magnetic film at the time of reproduction is expanded in diameter and is transferred to the second auxiliary magnetic film when the temperature profiles of the auxiliary magnetic films inside an optical spot are utilized. The magnetic domain of the magneto-optic recording film can be expanded and transferred, too, by means of magnetostatic coupling by using a non-magnetic film in place of the first auxiliary magnetic film. Pulse reproduction light subjected to power modulation in synchronism with a reproduction clock can be used at the time of reproduction. Even when a very small magnetic domain is recorded, the intensity of an amplified reproduction signal can be detected and excellent C/N can be obtained.
    • 磁光记录介质包括在基板上的第二辅助磁膜,第一辅助磁膜和磁光记录膜。 在临界温度TCR1和TCR2下,辅助磁膜从面内磁化转变为垂直磁化。 由于它们具有关系TCR1> TCR2,所以在再现时从磁光记录膜转移到第一辅助磁性膜的磁畴的直径扩大并且当第二辅助磁性膜的温度分布 利用光点内的辅助磁膜。 磁光记录膜的磁畴也可以通过使用非磁性膜代替第一辅助磁性膜的静磁耦合来扩展和转移。 在再现时可以使用经受与再现时钟同步的功率调制的脉冲再现光。 即使记录非常小的磁畴,也可以检测出放大的再现信号的强度,可以获得优异的C / N。
    • 7. 发明授权
    • Magneto-optic recording medium and reproducing method for reproducing magnetic domain in enlarged form on a reproducing layer
    • 磁光记录介质和再现层放大形式的磁畴再现方法
    • US06226234B1
    • 2001-05-01
    • US09091480
    • 1998-06-19
    • Satoru OhnukiNorio OhtaKatsusuke ShimazakiMasafumi YoshihiroHiroki TakaoHitoshi Watanabe
    • Satoru OhnukiNorio OhtaKatsusuke ShimazakiMasafumi YoshihiroHiroki TakaoHitoshi Watanabe
    • G11B1100
    • G11B11/10515G11B11/10584G11B11/10593
    • A magneto-optic recording medium includes a second auxiliary magnetic film, a first auxiliary magnetic film and a magneto-optic recording film on a substrate. The auxiliary magnetic films change from in-plane magnetization to vertical magnetization at critical temperatures TCR1 and TCR2. Since they have the relation TCR1>TCR2, the magnetic domain transferred from the magneto-optic recording film to the first auxiliary magnetic film at the time of reproduction is expanded in diameter and is transferred to the second auxiliary magnetic film when the temperature profiles of the auxiliary magnetic films inside an optical spot are utilized. The magnetic domain of the magneto-optic recording film can be expanded and transferred, too, by means of magnetostatic coupling by using a non-magnetic film in place of the first auxiliary magnetic film. Pulse reproduction light subjected to power modulation in synchronism with a reproduction clock can be used at the time of reproduction. Even when a very small magnetic domain is recorded, the intensity of an amplified reproduction signal can be detected and excellent C/N can be obtained.
    • 磁光记录介质包括在基板上的第二辅助磁膜,第一辅助磁膜和磁光记录膜。 在临界温度TCR1和TCR2下,辅助磁膜从面内磁化转变为垂直磁化。 由于它们具有关系TCR1> TCR2,所以在再现时从磁光记录膜转移到第一辅助磁性膜的磁畴的直径扩大并且当第二辅助磁性膜的温度分布 利用光点内的辅助磁膜。 磁光记录膜的磁畴也可以通过使用非磁性膜代替第一辅助磁性膜的静磁耦合来扩展和转移。 在再现时可以使用经受与再现时钟同步的功率调制的脉冲再现光。 即使记录非常小的磁畴,也可以检测出放大的再现信号的强度,可以获得优异的C / N。