Magnetic recording medium comprising protrusion on its surface a

Details Magnetic recording medium comprising protrusion on its surface a Magnetic recording medium comprising protrusion on its surface a

1985-07-24

1988-03-29

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record medium

360134, 360135, G11B 562, G11B 5712, G11B 578, G11B 582

Patent

active

047348100

ABSTRACT:
A magnetic recording medium comprising a ferromagnetic metal thin film layer formed on one surface of a flexible non-magnetic substrate and primarily comprising cobalt and oxygen is improved in durability by treating the substrate with a plasma at a frequency of 10 kHz to 200 kHz, and providing the magnetic layer on the surface with protrusions having a height of 30 to 300 .ANG. at an average density of at least 10.sup.5 /a.sup.2 per square millimeter of the surface, provided that the magnetic recording medium is passed for recording/reproducing operation across a magnetic head with a gap having a distance a as expressed n .mu.m.

REFERENCES:
patent: 4575475 (1986-03-01), Nakayama et al.
patent: 4578729 (1986-03-01), Suzuki et al.

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