Magnetic recording medium having a magnetic layer comprising hex

Details Magnetic recording medium having a magnetic layer comprising hex Magnetic recording medium having a magnetic layer comprising hex

1990-08-21

1992-05-19

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Composite

Of inorganic material

428900, 252 6251, G11B 500

Patent

active

051148013

ABSTRACT:
Disclosed herein is a magnetic recording medium having a magnetic layer comprising hexagonal ferrite magnetic particles each expressed as BaO.multidot.Fe.sub.12-x-y Sn.sub.x Mg.sub.y O.sub.18 (where, 0.55.ltoreq.x.ltoreq.0.88, 0.71.ltoreq.y.ltoreq.1.05). The hexagonal ferrite magnetic particles contained in this magnetic layer each have Sn and Mg partially substituted for Fe, the Sn and Mg being perfectly solid-soluble, thus being capable of providing hexagonal ferrite magnetic particles which are superior in crystalline properties and small in variation of composition. As a result, the coercivity distribution can be made further sensitive, both the self demagnetization and recording demagnetization in the short wave-length range can be reduced, and a higher reproducing output characteristic is attainable in the high density recording range.

REFERENCES:
patent: 3023166 (1962-02-01), Duinker et al.
patent: 4770933 (1988-09-01), Kitahata et al.
patent: 4820433 (1989-04-01), Yamamoto
Kubo et al., "IEEE Trans. Mag.", vol. Mag-18(6), 1122-1124 (1982).

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