发明授权
- 专利标题: Magnetic powder for magnetic recording and magnetic recording medium containing the same
- 专利标题(中): 用于磁记录的磁粉和含有该磁粉的磁记录介质
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申请号: US307284申请日: 1994-09-16
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公开(公告)号: US5494749A公开(公告)日: 1996-02-27
- 发明人: Osamu Kubo , Tatsumi Maeda , Tutomu Nomura , Shunji Kurisu , Etsuji Ogawa
- 申请人: Osamu Kubo , Tatsumi Maeda , Tutomu Nomura , Shunji Kurisu , Etsuji Ogawa
- 申请人地址: JPX Kanagawa
- 专利权人: Kabushiki Kaisha Toshiba
- 当前专利权人: Kabushiki Kaisha Toshiba
- 当前专利权人地址: JPX Kanagawa
- 优先权: JPX3-86376 19910418; JPX4-90644 19920410
- 主分类号: G11B5/706
- IPC分类号: G11B5/706 ; B32B5/16
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.
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