Composite magnetic powder, method for producing the same and rec

Details Composite magnetic powder, method for producing the same and rec Composite magnetic powder, method for producing the same and rec

1987-10-13

1990-09-18

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

252 6256, 252 6263, 428694, 428900, G11B 2300

Patent

active

049578120

ABSTRACT:
Disclosed is a composite magnetic powder comprising two crystal phases of a hexagonal ferrite portion and a spinel structure ferrite portion, which are different in thermal characteristic and in crystal structure and which are in a crystallographically epitaxial relation in each particle. The magnetic powder can be synthesized by reaction of starting components in a low temperature solution. Using the magnetic powder, a vertical magnetic recording medium can be provided, which is excellent in weather stability and suitable for short wavelength recording.

REFERENCES:
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patent: 4659626 (1987-04-01), Fukushima et al.
patent: 4707410 (1987-11-01), Hata et al.
patent: 4716077 (1987-12-01), Okita et al.
"Patent Abstracts of Japan", vol. 11, No. 366 (P-641), Nov. 11, 1987, p. 120P641 (JP-A-62129121).
"Patent Abstracts of Japan", vol. 12, No. 193 (E-617), Jun. 4, 1988, p. 147E617 (JP-A-62296501).
"Patent Abstracts of Japan", vol, 11, 342 (P-635), Nov. 10, 1987, p. 26P635 (JP-A-62124564).
Kiyama, "Bull. Chem. Soc. Japan", 49(7), pp. 1855-1860, (Jul. 1976).
Kubo et al., "IEEE Transactions on Magnetics", vol. MAG-18 (6), pp. 1122-1124, (Nov. 1982).

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