Magnetic recording medium with a CoPtCrB alloy thin film with a

Details Magnetic recording medium with a CoPtCrB alloy thin film with a Magnetic recording medium with a CoPtCrB alloy thin film with a

1994-12-27

1996-06-04

Resan, Stevan A.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

428 657, 428457, 428667, 428694T, 428694TS, 428900, 428928, 2041922, 427128, 427131, G11B 566

Patent

active

055231730

ABSTRACT:
A high-density longitudinal recording medium comprising a CoPtCrB alloy with a chromium content in excess of 17 atomic percent exhibits high coercivity, low noise, and high Curie temperatures. Films are prepared by sputter depositing a chromium or chromium alloy underlayer on a non-magnetic substrate. A strong [100] crystallographic orientation of the underlayer is required to achieve a low noise, high coercivity medium. This orientation is achieved by depositing the underlayer on a negatively biased substrate under high temperature, low pressure conditions. The oriented underlayer prevents the subsequently deposited CoPtCrB alloy from orienting itself in its preferred, c axis vertical orientation. The CoPtCrB alloy comprises 4 to 12 percent platinum, 18 to 23 percent chromium and 2 to 10 percent boron.

REFERENCES:
patent: 4789598 (1988-12-01), Howard et al.
patent: 5236791 (1993-08-01), Yahisa et al.
patent: 5266418 (1993-11-01), Hayashi et al.
patent: 5282946 (1994-02-01), Kinoshita et al.
N. Tani et al., "High Coercivity Hard Disk with CoCrPtB/Cr Media", IEEE Trans. Magn. vol. 27, No. 6, Nov. 1991, pp. 4736-4738.
C. R. Paik et al., "Magnetic Properties and Noise Characteristics of High Coercivity CoCrPtB/Cr Media", IEEE Trans. Magn. vol. 28, No. 5, Sep. 1992, pp. 3084-3086.
M. F. Doerner et al., "Magnetic Medium with Improved CoPtCr Alloy", IBM Technical Disclosure Bulletin, vol. 37, No. 4A, p. 243.

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