Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1989-11-16

1993-10-05

Resan, Stevan A.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428336, 428611, 428666, 428667, 428680, 428687, 428694SG, 428900, 428928, 428694BP, G11B 0500

Patent

active

052503380

ABSTRACT:
A magnetic recording medium which comprises a non-ferromagnetic substrate having two types of defects or irregularities formed thereon along a circumferential direction with different center line average roughnesses, on which a non-ferromagnetic metal film and a Co alloy ferromagnetic film are formed by sputtering in this order. The ferromagnetic film has such a crystal structure that a (200) plane is parallel to the surface of the substrate and a <011> orientation is toward a circumferential direction. Thus, the C axis of the ferromagnetic film is oriented toward the circumferential direction of the substrate. A method for fabricating the magnetic recording medium is also described wherein the distance between the substrate and the respective targets for the non-ferromagnetic metal film and the Cr alloy ferromagnetic film is set within a mean free path of sputtered particles and the substrate is heated to a temperature of from 150.degree. to 300.degree. C. when these films are formed by sputtering.

REFERENCES:
patent: 4652499 (1987-03-01), Howard
patent: 4735840 (1988-04-01), Hedgcoth
patent: 4749628 (1988-06-01), Ahlert et al.
patent: 5063120 (1991-11-01), Edmonson et al.

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