Magnetic recording medium and magnetic recording drive

Details Magnetic recording medium and magnetic recording drive Magnetic recording medium and magnetic recording drive

1995-10-02

1999-05-04

Resan, Stevan A.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

428336, 428635, 428667, 428674, 428694TS, 428694TM, 428900, G11B 566

Patent

active

059003235

ABSTRACT:
A non-magnetic substrate, a Cu layer having a film thickness ranging from 0.5 to 10 nm, a Cr layer having a film thickness of 100 nm or less, a magnetic layer made of CoCrPt alloy in which a percentage content of Cr ranges from 12 atoms % to 20 atoms % and a percentage content of Pt ranges from 4 atoms % to 18 atoms %, a protective layer and a lubricating layer are arranged in that order to form a magnetic recording medium. Because the Cu layer is sufficiently thinned, a medium noise is sufficiently reduced, and a medium S/N ratio is sufficiently heightened. Because the film thickness of the Cr layer is 100 nm or less, the medium noise is reduced. Because the composition of CoCrPt alloy is limited in the magnetic layer, the medium S/N ratio is heightened. In addition, it is preferred that another Cu layer having a film thickness ranging from 0.5 to 10 nm be inserted into the magnetic layer to divide the magnetic layer into two layers. In this case, the medium noise is reduced by 20%, and the medium S/N ratio is heightened. Therefore, even though a magnetoresistive effect type magnetic head is used to record or reproduce information in/from the magnetic recording medium, the medium noise is sufficiently reduced, and the medium R/N ratio is sufficiently heightened.

REFERENCES:
patent: 4833020 (1989-05-01), Shiroishi et al.
patent: 5047274 (1991-09-01), Tsuya et al.
patent: 5277960 (1994-01-01), Tsuya et al.
patent: 5370928 (1994-12-01), Funabashi et al.
patent: 5413835 (1995-05-01), Ikeda et al.
patent: 5427867 (1995-06-01), Kogure et al.
patent: 5482785 (1996-01-01), Mahvan et al.
Laminated CoPtCx/Cr Films For Low Noise Longitudinal Recording, Yang, et al., IEEE Transactions on Magnetics, vol. 27, No. 6, Nov. 1991, pp. 5052-5054.

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