Disk substrate for a perpendicular magnetic recording medium...

Details Disk substrate for a perpendicular magnetic recording medium... Disk substrate for a perpendicular magnetic recording medium...

2005-04-12

2009-11-24

Tarazano, D. Lawrence (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S832000, C360S135000

Reexamination Certificate

active

07622205

ABSTRACT:
A disk substrate for a perpendicular magnetic recording medium is, disclosed. The substrate exhibits sufficient productivity, serves the function of a soft magnetic backing layer of the perpendicular magnetic recording medium, and scarcely generates noise. A perpendicular magnetic recording medium using such a substrate also is disclosed. The disk substrate comprises at least a soft magnetic underlayer formed on a nonmagnetic base plate by means of an electroless plating method. The thermal expansion coefficient of the soft magnetic underlayer is larger than a thermal expansion coefficient of the nonmagnetic disk-shaped base plate. A saturation magnetostriction constant λs satisfies a relation λs≧−1×10−5.

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JA 2000-082211 machine translation.
JA 2000-163743 machine translation.
Asahi, T., et al. “Novel Soft Magnetic Underlayers for Double-layered Perpendicular Magnetic Recording Media: Electroless-Deposited Films of CoNiFe-based Alloy,” (Cont) (cont.) Digest of 9th Joint MMM/Intermag Conference, EP-12, p. 259 (2004).
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Japanese Official Action dated Aug. 4, 2009 for Japanese Application No. 2004-309723.

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