Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1998-05-13
1999-11-09
Pianalto, Bernard
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
2041921, 427131, 427132, 428 656, 428 657, 428336, 428611, 428635, 428662, 428667, 428678, 428680, 428694TS, 428694TC, 428900, 428928, B32B 302
Patent
active
059810181
ABSTRACT:
The present invention relates to high-coercivity magnetic recording media used in a hard disk drive. The magnetic recording medium comprises a nonmagnetic substrate, a seed layer comprising NiAl alloy sputtered onto the substrate, a sublayer comprising CrV alloy sputtered onto the seed layer, a magnetic layer comprising CoCrPtTaNb alloy sputtered onto the sublayer, and a carbon overcoat sputtered onto the magnetic layer. The magnetic recording medium of such a structure has improved signal-to-noise ratio, coercivity, overwrite capability, and orientation ratio thereby greatly improving the storage density and read/write capacity of the magnetic recording medium. Furthermore, the coercivity of the magnetic layer of CoCrPtTaNb alloy according to the present invention can be as high as 4000 Oersteds even without the use of the NiAl seed layer.
Lai Tai-hwang
Liang Hung-huei
Liang James
Lo Yu-Yun
Tung Chiun-Yen
Pianalto Bernard
Trace Storage Technology Corp.
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