Method of providing hexagonal ferrite magnetic powder with enhan

Details Method of providing hexagonal ferrite magnetic powder with enhan Method of providing hexagonal ferrite magnetic powder with enhan

1996-03-25

1997-11-11

Resan, Stevan A.

Coating processes

Magnetic base or coating

Magnetic coating

324200, 324204, 428402, 428694BH, 428900, G11B 5712

Patent

active

056861370

ABSTRACT:
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.

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