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    • 3. 发明授权
    • Magneto-optical recording medium having intermediate layer of in plane magnetization
    • 具有平面磁化中间层的磁光记录介质
    • US06272077B1
    • 2001-08-07
    • US09479256
    • 2000-01-07
    • Akira TakahashiMichinobu MiedaNaoyasu IketaniGo MoriJunsaku NakajimaYoshiteru MurakamiJunji Hirokane
    • Akira TakahashiMichinobu MiedaNaoyasu IketaniGo MoriJunsaku NakajimaYoshiteru MurakamiJunji Hirokane
    • G11B1110
    • G11B11/10584G11B11/10515G11B11/10586G11B11/10593
    • A magneto-optical memory medium according to the present invention comprises a reproducing layer, which has in-plane magnetization at room temperature and perpendicular magnetization when heated to above a predetermined temperature by a reproducing light beam; a recording layer, which is magnetostatically coupled to the reproducing layer; and an in-plane magnetized layer, provided adjacent to the recording layer, which has a Curie temperature at the above-mentioned predetermined temperature. In this medium, at temperatures below the predetermined temperature, signals recorded at high density in the recording layer are masked, and the above-mentioned magnetostatic coupling is suppressed, by magnetic masking by the in-plane magnetized layer. At temperatures above the predetermined temperature, however, within a domain forming part of the in-plane magnetized layer, the recording layer and the reproducing layer are magnetostatically coupled, and a recording bit of the recording layer is copied and expanded to a magnetic domain in the reproducing layer. Accordingly, with this medium, by reproducing from an expanded magnetic domain of the reproducing layer, even information from recording bits recorded at high density can be reproduced with high signal quality.
    • 根据本发明的磁光存储介质包括再现层,其在室温下具有面内磁化并且通过再现光束被加热到高于预定温度时的垂直磁化; 记录层,其被静磁耦合到再现层; 以及与记录层相邻的面内磁化层,居里温度在上述预定温度。 在该介质中,在低于预定温度的温度下,记录层中以高密度记录的信号被屏蔽,并且通过面内磁化层的磁屏蔽来抑制上述静磁耦合。 然而,在高于预定温度的温度下,在形成面内磁化层的一部分的区域内,磁静电耦合记录层和再现层,并且将记录层的记录位复制并扩展到磁畴中 再现层。 因此,利用该介质,通过从再现层的扩展磁畴再现,可以以高信号质量再现以高密度记录的记录位的信息。
    • 4. 发明授权
    • Magneto-optical recording medium having intermediate layer of in-plane
magnetization
    • 具有平面内磁化中间层的磁光记录介质
    • US06147939A
    • 2000-11-14
    • US32985
    • 1998-03-02
    • Akira TakahashiMichinobu MiedaNaoyasu IketaniGo MoriJunsaku NakajimaYoshiteru MurakamiJunji Hirokane
    • Akira TakahashiMichinobu MiedaNaoyasu IketaniGo MoriJunsaku NakajimaYoshiteru MurakamiJunji Hirokane
    • G11B11/105G11B11/00
    • G11B11/10584G11B11/10515G11B11/10586G11B11/10593
    • A magneto-optical memory medium according to the present invention comprises a reproducing layer, which has in-plane magnetization at room temperature and perpendicular magnetization when heated to above a predetermined temperature by a reproducing light beam; a recording layer, which is magnetostatically coupled to the reproducing layer; and an in-plane magnetized layer, provided adjacent to the recording layer, which has a Curie temperature at the above-mentioned predetermined temperature. In this medium, at temperatures below the predetermined temperature, signals recorded at high density in the recording layer are masked, and the above-mentioned magnetostatic coupling is suppressed, by magnetic masking by the in-plane magnetized layer. At temperatures above the predetermined temperature, however, within a domain forming part of the in-plane magnetized layer, the recording layer and the reproducing layer are magnetostatically coupled, and a recording bit of the recording layer is copied and expanded to a magnetic domain in the reproducing layer. Accordingly, with this medium, by reproducing from an expanded magnetic domain of the reproducing layer, even information from recording bits recorded at high density can be reproduced with high signal quality.
    • 根据本发明的磁光存储介质包括再现层,其在室温下具有面内磁化并且通过再现光束被加热到高于预定温度时的垂直磁化; 记录层,其被静磁耦合到再现层; 以及与记录层相邻的面内磁化层,居里温度在上述预定温度。 在该介质中,在低于预定温度的温度下,记录层中以高密度记录的信号被屏蔽,并且通过面内磁化层的磁屏蔽来抑制上述静磁耦合。 然而,在高于预定温度的温度下,在形成面内磁化层的一部分的区域内,磁静电耦合记录层和再现层,并且将记录层的记录位复制并扩展到磁畴中 再现层。 因此,利用该介质,通过从再现层的扩展磁畴再现,可以以高信号质量再现以高密度记录的记录位的信息。
    • 7. 发明授权
    • Magneto-optical storage media
    • 磁光存储介质
    • US06707766B2
    • 2004-03-16
    • US10099968
    • 2002-03-19
    • Go MoriNaoyasu IketaniMichinobu MiedaAkira Takahashi
    • Go MoriNaoyasu IketaniMichinobu MiedaAkira Takahashi
    • G11B1100
    • G11B11/10593G11B11/10584
    • A magneto-optical storage medium includes an interference layer, a magnetic domain expansion layer, an intermediate layer, a magnetic masking layer, a recording layer, and a protection layer which are sequentially formed on a substrate. The magnetic domain expansion layer produces a smaller frictional force due to wall coercivity than do the other magnetic layers. The intermediate layer has the Curie temperature TC2 which is lower than those of the other magnetic layers. The magnetic masking layer is in a perpendicular magnetization state at temperatures that are in a proximity of TC2, and changes into an in-plane magnetization state at temperatures that are higher than the proximity of TC2. The recording layer produces a higher coercive force than those produced by the magnetic domain expansion layer at room temperature.
    • 磁光存储介质包括依次形成在基板上的干涉层,磁畴扩展层,中间层,磁屏蔽层,记录层和保护层。 与其它磁性层相比,磁畴扩展层由于壁矫顽力而产生较小的摩擦力。 中间层的居里温度TC2低于其他磁性层的居里温度TC2。 磁屏蔽层在接近TC2的温度下处于垂直磁化状态,并且在高于TC2的接近度的温度下变为面内磁化状态。 记录层产生比在室温下由磁畴扩展层产生的矫顽力更高的矫顽力。
    • 8. 发明授权
    • Magneto-optical recording medium
    • 磁光记录介质
    • US06338911B1
    • 2002-01-15
    • US09429082
    • 1999-10-29
    • Go MoriNaoyasu IketaniMichinobu MiedaAkira Takahashi
    • Go MoriNaoyasu IketaniMichinobu MiedaAkira Takahashi
    • G11B566
    • G11B11/10515G11B11/10584G11B11/10593Y10S428/90
    • A reproduction layer, a magnetic domain extending layer, an intermediate layer, and a recording layer are formed in this order. The magnetic domain extending layer, the intermediate layer, and the recording layer are exchange-coupled. The intermediate layer has a Curie temperature lower than that of any other magnetic layer. A non-magnetic intermediate layer is formed between the reproduction layer and the magnetic domain extending layer. Upon reproduction, magnetization information in the recording layer is transferred to and extended in the magnetic domain extending layer, where an extended magnetic domain is formed. The reproduction layer is magnetostatically coupled with the magnetic domain extending layer, so that the extended magnetic domain is transferred to the reproduction layer. This makes it possible to provide a magneto-optical recording medium characterized in moving of magnetic domain walls and extension of magnetic domains in good conditions, and increased signal intensity with a simpler structure.
    • 依次形成再生层,磁畴延伸层,中间层和记录层。 磁畴延伸层,中间层和记录层是交换耦合的。 中间层的居里温度低于任何其他磁性层的居里温度。 在再现层和磁畴延伸层之间形成非磁性中间层。 在再现时,记录层中的磁化信息被转移到扩展磁畴的磁畴延伸层中并扩展。 再现层与磁畴延伸层磁静电耦合,从而将扩展磁畴转移到再现层。 这使得可以提供一种磁光记录介质,其特征在于在良好的条件下磁畴壁的移动和磁畴的延伸,并且以更简单的结构增加信号强度。
    • 9. 发明授权
    • Magneto-optical recording medium
    • 磁光记录介质
    • US06477120B1
    • 2002-11-05
    • US09451260
    • 1999-11-30
    • Naoyasu IketaniGo MoriMichinobu MiedaAkira Takahashi
    • Naoyasu IketaniGo MoriMichinobu MiedaAkira Takahashi
    • G11B1100
    • G11B11/10586G11B11/10515G11B11/10584
    • In order to provide a magneto-optical recording medium which can select a single recording magnetic domain in the recording layer accurately and expand and transfer the same to the reproducing layer, the magneto-optical recording medium is arranged in the following manner. That is, the magnetization direction of the reproducing layer is in-plane at room temperature and shifts to perpendicular at or above a predetermined temperature Ttrans.. The recording layer is a magnetic layer which is magneto-statically coupled to the reproducing layer and shows the perpendicular magnetization up to its Curie temperature. The magnetic mask layer is provided between the recording layer and reproducing layer, and the magnetization thereof is reduced to 0 (zero) at or above a predetermined temperature (Tm) which is at or above Ttrans.. The magnetization of the magnetic mask layer is larger than that of the recording layer at least in a range between room temperature and Ttrans..
    • 为了提供可以精确地选择记录层中的单个记录磁畴并将其扩展并传送到再现层的磁光记录介质,磁光记录介质以如下方式布置。 也就是说,再现层的磁化方向在室温下处于平面,并在预定温度T trans以上移动到垂直方向。记录层是磁性层,磁性层与再现层磁耦合,并显示出 垂直磁化强度达其居里温度。 磁记录层设置在记录层和再现层之间,其磁化强度在等于或高于Ttrans的预定温度(Tm)以上或者高于Ttrans的0(零)。磁屏蔽层的磁化强度为 大于记录层的至少在室温和Ttrans之间的范围内。