Magnetic memory disk

Details Magnetic memory disk Magnetic memory disk

1984-06-11

1986-05-13

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Having variation in thickness

428610, 428650, 428658, 428668, 428680, 428928, 360135, G11B 566, G11B 582

Patent

active

045886539

ABSTRACT:
A magnetic memory disk which has controlled magnetic characteristics in the radial direction is provided by controlling the thickness and composition of the magnetic layer which is formed on the disk. The thickness of the layer may be varied in the radial direction to control the remanence of the disk and the composition of the magnetic layer varied to control the coercivity of the disk. The magnetic layer is formed by an electroplating operation employing one or more rotating apertured masks in an electrolyte solution between an anode and a disk (cathode) which is to be plated. The thickness of the plated layer is determined by the configuration of the apertures in the mask, and the relative composition of the layer is determined by the variation and distance of the mask to the disk in the radial direction. Thickness characteristics of layers other than the magnetic layer may also be precisely controlled in the radial direction to achieve desired characteristics.

REFERENCES:
patent: 3466156 (1969-09-01), Peters et al.
patent: 4029541 (1977-06-01), Barlow et al.
patent: 4144160 (1979-03-01), Faulkner
patent: 4304641 (1981-12-01), Grandia et al.
patent: 4359375 (1982-11-01), Smith
patent: 4469566 (1984-09-01), Wray

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