Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1994-01-13

1997-01-28

Nakarani, D. S.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

427131, 428336, 428694B, 428694BS, 428694BR, 428694BN, 428694BH, 428694BM, 428900, B05D 512, G11B 566, G11B 570

Patent

active

055976387

ABSTRACT:
The present invention provides a magnetic recording medium comprising a nonmagnetic layer mainly having an inorganic nonmagnetic particle dispersed in a binder provided on a nonmagnetic flexible support and a magnetic layer having a ferromagnetic particle dispersed in a binder, characterized in that the magnetic layer comprises a hexagonal ferrite magnetic material and exhibits a thickness of 1 .mu.m or less, or 2.5 .mu.m or less in total if there are a plurality of magnetic layers, a central line average surface roughness of 0.006 .mu.m or less, SFD of 0.3 or less in the longitudinal direction on the plane and Br/Hc of less than 1.5, whereby the short wavelength recording can be remarkably improved in electro-magnetic conversion characteristics, particularly 7 MHz output.

REFERENCES:
patent: 4396668 (1983-08-01), Saito et al.
patent: 4442159 (1984-04-01), DeZawa et al.
patent: 4720411 (1988-01-01), Shimozawa et al.
patent: 5098773 (1992-03-01), Saito et al.
patent: 5188907 (1993-02-01), Kawahara et al.

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