Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1992-04-16
1995-01-03
Thibodeau, Paul J.
Stock material or miscellaneous articles
Composite
Of inorganic material
252 6256, 428402, 428694BH, 428900, G11B 566
Patent
active
053785479
ABSTRACT:
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.
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Kubo Osamu
Kurisu Shunji
Maeda Tatsumi
Nomura Tutomu
Ogawa Etsuji
Kabushiki Kaisha Toshiba
Le H. Thi
Thibodeau Paul J.
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