Perpendicular magnetic recording medium, method for producing th

Details Perpendicular magnetic recording medium, method for producing th Perpendicular magnetic recording medium, method for producing th

1986-01-15

1987-05-19

Sheehan, John P.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

428678, 428928, H01F 100

Patent

active

046667881

ABSTRACT:
A magnetic recording medium conventionally utilizes the in-plane magnetization mode, but recently the perpendicular magnetization mode utilizing the perpendicular anisotropy of an hcp cobalt alloy layer, in which the C axis is oriented perpendicular to the layer surface, has been proposed. The known perpendicular magnetic recording medium is produced by means of RF sputtering and comprises a Permalloy layer, as layer of a low coercive-force material, between the nonmagnetic base and the hcp cobalt alloy layer. The perpendicular anisotropy attained by the present invention is very excellent and is superior to that of a perpendicular recording medium having no Permalloy layer because a Co-Ta alloy is used as the layer of a low coercive-force material.

REFERENCES:
patent: 4060470 (1977-11-01), Clarke
patent: 4374009 (1983-02-01), Chen et al.
patent: 4407894 (1983-10-01), Kadokura et al.
patent: 4410603 (1983-10-01), Yamamori et al.
patent: 4576700 (1986-03-01), Kadokura et al.
Kadokura et al., IEEE Trans. on Magnetics, vol. MAG-17, No. 6, Nov. 1981, pp. 3175-3177.

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