Magnetic powder

Details Magnetic powder Magnetic powder

2004-08-06

2008-03-18

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

C428S842400, C428S842600

Reexamination Certificate

active

07344779

ABSTRACT:
A fine magnetic powder suitable for magnetic tape capable of high-density magnetic recording is provided that helps to prevent degradation of tape surface property and durability with increasing fineness of the magnetic powder particles, which magnetic powder consists of particles composed chiefly of Fe whose surface layer contains an oxide of at least one of Al, Si and Ra (where Ra represents one or more rare earth elements, defined as including Y), has an average particle diameter of less than 70 nm, the number of basic sites on the particle surface of not greater than 0.85 sites
m2, and the number of acid sites on the particle surface of not greater than 0.75 sites
m2.

REFERENCES:
patent: 6139946 (2000-10-01), Bailey et al.
patent: 2004/0112472 (2004-06-01), Pereira et al.
patent: 2002-289415 (2002-04-01), None

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