Method and apparatus for producing electroplated magnetic memory

Details Method and apparatus for producing electroplated magnetic memory Method and apparatus for producing electroplated magnetic memory

1983-08-29

1984-09-04

Tufariello, Thomas

Chemistry: electrical and wave energy

Processes and products

204DIG7, C25D 500

Patent

active

044695667

ABSTRACT:
A process and apparatus for producing magnetic memory disks, and the like, of the type in which a thin layer of fine grain nickel/phosphorous paramagnetic material is first deposited on a large grain electrically conductive substrate, and a main magnetic layer is then electroplated over the nickel/phosphorous paramagnetic layer. In the practice of the method of the invention, the paramagnetic layer is electroplated onto the substrate through one or more openings in one or more rotating masks to provide directly a smooth fine grain layer of uniform density and thickness so as to obviate any necessity for time consuming and expensive polishing and burnishing operations of the paramagnetic film prior to the electroplating thereon of the main magnetic film; and the magnetic layer is also electroplated onto the paramagnetic layer through openings in one or more masks to provide a magnetic layer of controlled thickness for uniform magnetic response over the entire surface of the disk.

REFERENCES:
patent: 3407126 (1968-10-01), Koretzky
patent: 3463708 (1969-08-01), Grant
patent: 3634047 (1972-01-01), Faulkner
patent: 3637471 (1972-01-01), Faulkner
patent: 3788897 (1974-01-01), Gerard
patent: 3950234 (1976-04-01), Faulkner
patent: 4144160 (1979-03-01), Faulkner
patent: 4304641 (1981-12-01), Grandia
patent: 4359375 (1982-11-01), Smith

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