Thin-film recording medium with thin chromium underlayer

Details Thin-film recording medium with thin chromium underlayer Thin-film recording medium with thin chromium underlayer

1992-10-22

1998-04-28

Lund, Valerie

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

428928, 428667, 428666, G11B 2300

Patent

active

057442533

ABSTRACT:
A magnetic thin-film medium characterized by high coercivity, loop squareness, and signal-to-noise ratio characteristics. The medium includes a disc-like substrate, a sputtered Cr underlayer having a thickness between 100-300 .ANG., and a sputtered Co alloy magnetic thin-film layer having a thickness between 250-800 .ANG.. The sputtered Cr and magnetic layers are preferably formed under sputtering conditions in which a negative bias of between -50 to -600 volts is applied to the substrate.

REFERENCES:
patent: 5023148 (1991-06-01), Fisher et al.
patent: 5024903 (1991-06-01), Mizukami
patent: 5057200 (1991-10-01), Lal et al.
patent: 5084152 (1992-01-01), Lin

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