Method of preparing recording media for a disk drive and disk dr

Details Method of preparing recording media for a disk drive and disk dr Method of preparing recording media for a disk drive and disk dr

1993-11-03

1995-08-15

Kiliman, L.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428141, 428336, 428409, 428611, 428650, 428651, 428652, 428654, 428660, 428667, 428666, 428694T, 428694TS, 428694TR, 428694SG, 428900, B32B 302, B32B 310, G11B 566

Patent

active

054417880

ABSTRACT:
A magnetic recording disk has a layered structure comprising a metal substrate, a layer of NiP atop the metal substrate, the NiP layer having a surface roughness of less than 2.0 nanometers RMS, a metal layer over the polished NiP layer, the metal layer having a desired textured outer surface as a result of the sputter deposition, the textured outer surface being characterized by a cobblestone-like metallic grain structure with between 10 and 100 grains per square micron, an RMS surface roughness of between 1.0 and 8.0 nanometers, and with peak heights as measured from the mean plane of the surface over a 10 micron square area of between 2.0 and 20.0 nanometers, a magnetic layer atop the metal layer.

REFERENCES:
patent: 4610911 (1980-09-01), Opfer
patent: 4939045 (1990-07-01), Yoshida
patent: 5063120 (1991-11-01), Edmonson
patent: 5122423 (1992-06-01), Hase
patent: 5162158 (1992-11-01), Christner
patent: 5202810 (1993-04-01), Nakamura
patent: 5268207 (1993-12-01), Kruger
patent: 5314745 (1994-05-01), Okumura
patent: 5316844 (1994-05-01), Suzuki

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