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    • 7. 发明授权
    • Magnetic powder for magnetic recording and magnetic recording medium
containing the same
    • 用于磁记录的磁粉和含有该磁粉的磁记录介质
    • US5494749A
    • 1996-02-27
    • US307284
    • 1994-09-16
    • Osamu KuboTatsumi MaedaTutomu NomuraShunji KurisuEtsuji Ogawa
    • Osamu KuboTatsumi MaedaTutomu NomuraShunji KurisuEtsuji Ogawa
    • G11B5/706B32B5/16
    • G11B5/70678Y10S428/90Y10T428/2982
    • 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.
    • 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。
    • 10. 发明授权
    • Magnetic powder for magnetic recording and magnetic recording medium
containing the same
    • 用于磁记录的磁粉和含有该磁粉的磁记录介质
    • US5378547A
    • 1995-01-03
    • US869298
    • 1992-04-16
    • Osamu KuboTatsumi MaedaTutomu NomuraShunji KurisuEtsuji Ogawa
    • Osamu KuboTatsumi MaedaTutomu NomuraShunji KurisuEtsuji Ogawa
    • C01G49/00C09D5/23C09D7/12G11B5/706H01F1/047G11B5/66
    • G11B5/70678Y10S428/90Y10T428/2982
    • 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.
    • 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。