Magnetic recording medium comprising a glass substrate of contro

Details Magnetic recording medium comprising a glass substrate of contro Magnetic recording medium comprising a glass substrate of contro

1990-06-21

1992-03-10

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428336, 428409, 428432, 428694, 428695, 428900, 428 65, 427128, 2041922, G11B 2300

Patent

active

050948989

ABSTRACT:
A magnetic recording disk comprising a rigid substrate and a magnetic layer of the continuous thin film type predominantly composed of .gamma.-Fe.sub.2 O.sub.3 shows high durability, especially CSS durability when the magnetic layer has specific peak area ratios in an X-ray diffraction chart thereof, the surface roughness of the substrate and medium surface is controlled to desired ranges, and a lubricating film of a perfluoro derivative of poly(n-propylene oxide) with a specific molecular weight is used. Reliable recording/reproduction can be conducted on the magnetic recording disk using a flying magnetic head.

REFERENCES:
patent: 3996095 (1976-12-01), Ahn et al.
patent: 4188434 (1980-02-01), Loran
patent: 4704199 (1987-11-01), Yokokawa et al.
patent: 4920014 (1990-04-01), Hirai et al.

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