Chemistry: electrical and wave energy – Apparatus – Coating – forming or etching by sputtering
Patent
1983-12-12
1986-04-08
Metz, Andrew H.
Chemistry: electrical and wave energy
Apparatus
Coating, forming or etching by sputtering
204 384, 204 40, C25D 512, C25D 550
Patent
active
045811091
ABSTRACT:
A process for producing magnetic plated media suitable for use in high-performance disk drives is disclosed. A layer of nickel is first provided on a standard aluminum alloy substrate, by electroless deposition, to improve adhesion of subsequent layers. A layer of nickel phosphorous and a magnetic layer of nickel cobalt are then, in turn, electroplated. The plated media disk is then oxidized below a nickel-magnetizing temperature to provide a protective outer surface.
A variation of this process is also disclosed. This time a magnetically-shielding copper layer is electroplated over the first nickel layer. The nickel phosphorous and nickel cobalt layers are then electroplated on as before. The plated media can now be oxidized at a temperature higher than the nickel-magnetizing temperature to speed up the process.
REFERENCES:
patent: 3634209 (1972-01-01), Wolf et al.
patent: 3681225 (1972-08-01), Genma et al.
patent: 3726771 (1973-04-01), Coll-Palagos
patent: 3886052 (1975-05-01), Smith
Goor Dan
Niles Everett
Stone Robert L.
Digital Equipment Corporation
Leader William T.
Metz Andrew H.
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