Magnetic plated media

Details Magnetic plated media Magnetic plated media

1985-12-26

1986-10-28

O'Keefe, Veronica

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428652, B32B 1500

Patent

active

046198725

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: 4162350 (1979-07-01), Yanagisawa et al.
patent: 4326229 (1982-04-01), Yanagisawa et al.
patent: 4552820 (1985-11-01), Lin et al.

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