Magnetic recording medium and manufacturing method thereof

Details Magnetic recording medium and manufacturing method thereof Magnetic recording medium and manufacturing method thereof

1988-07-07

1991-09-10

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of inorganic material

2041922, 428611, 428667, 428900, G11B 2300

Patent

active

050472976

ABSTRACT:
A magnetic recording medium, comprising Cr base layer containing up to about 25 atom % of nitrogen, preferably 5 to 15 atom %, and a magnetic film of Co alloy such as Co-Ni or Co-Ni-Cr alloy material deposited thereon, shows a clear improvement over that using a pure Cr base layer without nitrogen content in medium noise level and S/N ratio. In case of about 10 atom % nitrogen content in the base layer, the medium noise level is reduced by half and the S/N ratio is improved by 6 to 9 dB, while the other magnetic characteristics such as coercivity Hc, residual magnetization Br, and squareness ratio Sq are remaining the same.

REFERENCES:
patent: 4231816 (1980-11-01), Cuomo et al.
patent: 4675240 (1987-06-01), Weiss
patent: 4696862 (1987-09-01), Kawana et al.
patent: 4745031 (1988-05-01), Nakayama et al.
patent: 4749459 (1988-06-01), Yamashita et al.
patent: 4880514 (1989-11-01), Scott et al.
Patent Abstracts of Japan, vol. 11, No. 72.
Patent Abstracts of Japan, vol. 9, No. 236.

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