Magnetic recording media and methods for producing the same

Details Magnetic recording media and methods for producing the same Magnetic recording media and methods for producing the same

1996-06-27

1998-10-20

Zimmerman, John J.

Stock material or miscellaneous articles

Composite

Of inorganic material

428694TC, 428694TR, 428694ST, 427128, 2041921, C23C 1434, G11B 562, G11B 564

Patent

active

058244271

ABSTRACT:
A magnetic recording medium comprising a non-magnetic underlayer and a CoPt magnetic layer provided on a substrate in this order wherein the non-magnetic underlayer comprises one or more non-magnetic layers, one of the non-magnetic layers which is in contact with the CoPt magnetic layer consists mainly of Cr and Mo, and difference (d.sub.(002) -d.sub.(110)) obtained by subtracting a crystalline lattice spacing of bcc (110) faces in the non-magnetic layer consisting mainly of Cr and Mo from a crystalline lattice spacing of hcp (002) faces in the magnetic layer falls within a range of from 0.002 to 0.032 .ANG., which shows a high magnetic coercive force and square ratio and a low medium noise, and a method for producing the magnetic recording medium mentioned above wherein at least the non-magnetic layer consisting mainly of Cr and Mo and the CoPt magnetic layer are formed by a sputtering technique using a substrate heating temperature within a range of 250.degree. to 425.degree. C. and an Ar gas pressure within a range of 0.5 to 10 mTorr.

REFERENCES:
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patent: 4939045 (1990-07-01), Yoshida et al.
patent: 5242762 (1993-09-01), Kouchiyama et al.
patent: 5413873 (1995-05-01), Mizakami et al.
patent: 5456978 (1995-10-01), Lal et al.
patent: 5580667 (1996-12-01), Lal et al.
patent: 5626943 (1997-05-01), Tenhover

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