Perpendicular magnetic recording media with improved...

Details Perpendicular magnetic recording media with improved... Perpendicular magnetic recording media with improved...

2007-02-13

2007-02-13

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C204S192200, C427S131000

Reexamination Certificate

active

10663670

ABSTRACT:
A perpendicular magnetic recording medium, comprising:(a) a non-magnetic substrate having a surface; and(b) a layer stack formed over the substrate surface, comprising in overlying sequence from the substrate surface:(i) a magnetically soft underlayer;(ii) an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material formed thereon; and(iii) at least one crystallographically oriented magnetically hard perpendicular recording layer;wherein the magnetically soft underlayer is sputter-deposited at a sufficiently large target-to-substrate spacing and at a sufficiently low gas pressure selected to provide the underlayer with a smooth surface having a low average surface roughness Ra below about 0.3 nm, as measured by Atomic Force Microscopy (AFM).

REFERENCES:
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patent: 6835475 (2004-12-01), Carey et al.
patent: 2002/0164501 (2002-11-01), Hikosaka
patent: 2004/0038082 (2004-02-01), Tsumori

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