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    Magnetic powder for magnetic recording and magnetic recording medium containing the same
    2.
    发明授权
    Magnetic powder for magnetic recording and magnetic recording medium containing the same 失效
    用于磁记录的磁粉和含有该磁粉的磁记录介质

    公开(公告)号：US5494749A

    公开(公告)日：1996-02-27

    申请号：US307284

    申请日：1994-09-16

    申请人： Osamu Kubo ,  Tatsumi Maeda ,  Tutomu Nomura ,  Shunji Kurisu ,  Etsuji Ogawa

    发明人： Osamu Kubo ,  Tatsumi Maeda ,  Tutomu Nomura ,  Shunji Kurisu ,  Etsuji Ogawa

    IPC分类号： G11B5/706 ,  B32B5/16

    CPC分类号： G11B5/70678 ,  Y10S428/90 ,  Y10T428/2982

    摘要： A magnetic powder for magnetic recording is disclosed which comprises composite magnetic particles (A), each of which contains hexagonal ferrite and spinel structure ferrite, and single phase magnetic particles of hexagonal ferrite (B). When the mixing ratio [(A):(B)] of (A) and (B) in the range from 5:95 to 95:5, remarkable effect can be obtained. Especially, when the mixing ratio of (A) and (B) is in the range from 5:95 to 30:70, the dispersion property is improved due to disturbance of magnetic stacking. Thus, the magnetic powder in this mixing ratio is particularly suitable for magnetic recording in a short wavelength range. When the mixing ratio of (A) and (B) is in the range from 70:30 to 95:5, the reproduction output is improved due to activation of (A). Thus, the magnetic powder in this mixing ratio is specifically suitable for magnetic recording in a long wavelength range. By containing the magnetic powder described above, a perpendicular magnetic recording medium with high electromagnetic characteristics, particularly a high S/N ratio and a low noise can be obtained.

    摘要翻译： 公开了一种用于磁记录的磁粉，其包含复合磁性颗粒（A），每个复合磁性颗粒包含六方晶系铁氧体和尖晶石结构铁氧体，以及六方晶系铁氧体的单相磁性颗粒（B）。 当（A）和（B）的混合比[（A）：（B）]在5:95至95:5的范围内时，可以获得显着的效果。 特别是，当（A）和（B）的混合比在5:95至30:70的范围内时，由于磁性堆叠的干扰，分散性能得到改善。 因此，这种混合比的磁粉特别适用于短波长范围内的磁记录。 当（A）和（B）的混合比在70:30至95:5的范围内时，由于（A）的激活，再现输出被改善。 因此，该混合比例的磁粉特别适用于长波长范围的磁记录。 通过含有上述磁粉，可以获得具有高电磁特性，特别是高S / N比和低噪声的垂直磁记录介质。

    Method of providing hexagonal ferrite magnetic powder with enhanced coercive force stability
    4.
    发明授权
    Method of providing hexagonal ferrite magnetic powder with enhanced coercive force stability 失效
    提供增强矫顽力稳定性的六方晶系铁氧体磁粉的方法

    公开(公告)号：US5686137A

    公开(公告)日：1997-11-11

    申请号：US621330

    申请日：1996-03-25

    申请人： Etsuji Ogawa ,  Osamu Kubo ,  Shunji Kurisu ,  Tatsumi Maeda

    发明人： Etsuji Ogawa ,  Osamu Kubo ,  Shunji Kurisu ,  Tatsumi Maeda

    IPC分类号： G11B5/706 ,  G11B5/708 ,  G11B5/712

    CPC分类号： G11B5/708 ,  G11B5/70631 ,  G11B5/70678 ,  Y10S428/90 ,  Y10T428/2982

    摘要： An object of the present invention is to provide a magnetic powder for magnetic recording and a magnetic recording medium wherein stability of a coercive force of each of the magnetic powder and the magnetic recording medium is improved. The magnetic powder for magnetic recording and the magnetic recording medium having the magnetic powder used therfor are characterized in that the magnetic powder is composed mainly of a plate-shaped ferrite having a crystalline anisotropy and containing an element effective for reducing a temperature coefficient of coercive force of the magnetic powder, and that a difference between a coercive force (Hc) of the magnetic powder at a room temperature and a coercive force (Hc(s)) of the magnetic powder in such a state that the magnetic powder is dispersively deposited on the surface of silica (SiO.sub.2) powder particles is 100 (Oe) or less.

    摘要翻译： 本发明的目的是提供一种磁记录用磁粉和磁记录介质，其中磁粉和磁记录介质的矫顽力的稳定性提高。 用于磁记录的磁粉和具有使用的磁粉的磁记录介质的特征在于，磁粉主要由具有结晶各向异性的板状铁氧体构成，并含有有效降低矫顽力温度系数的元素 的磁性粉末，并且在磁性粉末分散沉积的状态下，在室温下的磁粉的矫顽力（Hc）与磁粉的矫顽力（Hc（s））之间的差异 二氧化硅（SiO2）粉末颗粒的表面为100（Oe）以下。

    Magnetic powder for magnetic recording and magnetic recording medium containing the same
    5.
    发明授权
    Magnetic powder for magnetic recording and magnetic recording medium containing the same 失效
    用于磁记录的磁粉和含有该磁粉的磁记录介质

    公开(公告)号：US5378547A

    公开(公告)日：1995-01-03

    申请号：US869298

    申请日：1992-04-16

    申请人： Osamu Kubo ,  Tatsumi Maeda ,  Tutomu Nomura ,  Shunji Kurisu ,  Etsuji Ogawa

    发明人： Osamu Kubo ,  Tatsumi Maeda ,  Tutomu Nomura ,  Shunji Kurisu ,  Etsuji Ogawa

    IPC分类号： C01G49/00 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  H01F1/047 ,  G11B5/66

    CPC分类号： G11B5/70678 ,  Y10S428/90 ,  Y10T428/2982

    摘要： A magnetic powder for magnetic recording is disclosed which comprises composite type magnetic particles (A), each of which contains hexagonal ferrite and spinel structure ferrite, and single phase type magnetic particles of hexagonal ferrite (B). When the mixing ratio of (A) and (B) in the range from 5:95 to 95:5, remarkable effect can be obtained. Especially, when the mixing ratio of (A) and (B) is in the range from 5:95 to 30:70, the dispersion property is improved due to disturbance of magnetic stacking. Thus, the magnetic powder in this mixing ratio is particularly suitable for magnetic recording in a short wavelength range. When the mixing ratio of (A) and (B) is in the range 70: 30 to 95:5, the reproduction output is improved due to activation of (A) . Thus, the magnetic powder in this mixing ratio is specifically suitable for magnetic recording in a long wavelength range. By containing the magnetic powder described above, a perpendicular magnetic recording medium with high electromagnetic characteristics, particularly a high S/N ratio and a low noise can be obtained.

    摘要翻译： 公开了一种用于磁记录的磁粉，其包括复合型磁性颗粒（A），每个复合型磁性颗粒包含六方晶系铁氧体和尖晶石结构铁氧体，以及六方晶系铁氧体（B）的单相型磁性颗粒。 当（A）和（B）的混合比在5:95至95:5的范围内时，可以获得显着的效果。 特别是，当（A）和（B）的混合比在5:95至30:70的范围内时，由于磁性堆叠的干扰，分散性能得到改善。 因此，这种混合比的磁粉特别适用于短波长范围内的磁记录。 当（A）和（B）的混合比在70:30至95:5的范围内时，由于（A）的激活，再现输出被改善。 因此，该混合比例的磁粉特别适用于长波长范围的磁记录。 通过含有上述磁粉，可以获得具有高电磁特性，特别是高S / N比和低噪声的垂直磁记录介质。