Protective layer for magnetic disk

Details Protective layer for magnetic disk Protective layer for magnetic disk

1987-02-03

1989-08-29

Thibodeau, Paul J.

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

427 34, 427 38, 427131, 428694, 428695, 428900, G11B 564

Patent

active

048616621

ABSTRACT:
A magnetic recording disk composed of a substrate, a magnetic layer, and a protective/lubricative carbon layer is etched and has oxygen embedded into the surface of the disk. This carbon/oxygen surface is extremely smooth, and wears better than prior art disks not having oxygen imbedded in the surface. This altered layer enables a magnetic disk to undergo over twice the number of start/stop cycles without incurring damage from magnetic transducers used to read information from the recording than similar disks prepared without oxygen in the outer layer. A method of plasma etching is used to embed the oxygen into the surface.

REFERENCES:
patent: 4411963 (1983-10-01), Aine et al.
patent: 4503125 (1985-03-01), Nelson et al.
patent: 4596735 (1986-06-01), Noguchi et al.
patent: 4643915 (1987-02-01), Arai et al.
patent: 4647494 (1987-03-01), Meyerson et al.
patent: 4737415 (1988-04-01), Ichijo et al.

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