Magnetic particles for perpendicular magnetic recording

Details Magnetic particles for perpendicular magnetic recording Magnetic particles for perpendicular magnetic recording

1992-07-20

1994-10-25

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6256, 252 6258, 252 6259, 252 6262, C04B 3526

Patent

active

053586603

ABSTRACT:
Magnetic particles for perpendicular magnetic recording, which are hexagonal ferrite particles having a hexagonal platelet shape, and are represented by the formula MM'.sub.x M".sub.y Fe.sub.2x-y+2z O.sub.1+4x+3z (wherein M represents at least one element or a combination of elements selected from Ba, Sr, Ca and Pb; M' is at least one element or a combination of elements selected from Co, Zn and Mn; M" is at least one element or a combination of elements selected from Co, Ti, In, Zn, Mn, Ge, Nb, Zr, Ta, V and Sn, x is a number of z/4 to z, inclusive; y is a number of 0 to (x+z)/3, inclusive; and z is a number of 5.5 to 9.0, inclusive), and has an average particle size of from 0.01 to 0.3 .mu.m. The magnetic particles have a novel crystal structure different from both the magnetoplumbite structure and the spinel structure, even internally of the individual particles.

REFERENCES:
patent: 4828916 (1989-05-01), Yamamoto et al.
patent: 4851292 (1989-07-01), Nagai et al.
patent: 4886714 (1989-12-01), Torii et al.

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