Magnetic recording media with high SNR and high thermal...

Details Magnetic recording media with high SNR and high thermal... Magnetic recording media with high SNR and high thermal...

2005-01-04

2005-01-04

Bernatz, Kevin M. (Department: 1773)

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

C428S636000, C428S663000, C428S666000, C428S667000, C428S323000, C428S336000, C428S409000, C428S690000, C428S690000

Reexamination Certificate

active

06838189

ABSTRACT:
Magnetic recording media exhibiting high SNR and high thermal stability are produced by sputter depositing a magnetic alloy overlying a non-magnetic substrate, e.g., on an underlayer, heating to eliminate thermally unstable small grains thereby increasing the average grain size of the magnetic alloy layer but narrowing the grain size distribution, depositing a layer comprising a non-ferromagnetic element, and then heating to diffuse the non-ferromagnetic element into the grain boundaries of the heat treated magnetic alloy layer. Embodiments include heating to diffuse the non-ferromagnetic element leaving a layer comprising the non-ferromagnetic element, at a thickness up to about 3Å, on the magnetic alloy layer, with the amount of the non-ferromagnetic element diffused into the grain boundaries of the magnetic alloy layer gradually decreasing from the upper surface of the magnetic alloy layer toward the underlayer.

REFERENCES:
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patent: 6555248 (2003-04-01), Takahashi et al.
patent: 6623873 (2003-09-01), Matsuda et al.
patent: 20020068200 (2002-06-01), Inaba et al.
patent: 56-148732 (1981-11-01), None
patent: 62-202316 (1987-09-01), None

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