Method for producing a square loop magnetic media for very high

Details Method for producing a square loop magnetic media for very high Method for producing a square loop magnetic media for very high

1978-06-23

1979-04-17

Steiner, Arthur J.

Coating processes

Magnetic base or coating

Magnetic coating

427130, 427131, 427132, 427305, 428658, 428650, 428668, 428680, 428928, C23C 302

Patent

active

041501721

ABSTRACT:
A magnetic recording film having high magnetic remanence and unusually good square loop characteristics at thicknesses of between one and five microinches can be deposited directly on non-magnetic electroless nickel from an electroless bath containing cobalt ions, citrate ions, hypophosphite ions, phosphate ions and, if desired, nickel ions. The electroless bath may also contain an ethanolamine, or mixture thereof, as a wetting agent and brightener. The coercive force of the magnetic recording film can be selected to lie between 300 and 1,000 oersteds by adjusting the pH of the bath. Thicker structures with good square loop characteristics and high coercive force can be prepared by the successive plating of two or more magnetic thin films separated by thin films of non-magnetic nickel-phosphorus.

REFERENCES:
patent: 3180715 (1965-04-01), Simon
patent: 3350180 (1967-10-01), Croll
patent: 3466156 (1969-09-01), Peters et al.
patent: 3702239 (1972-11-01), Nagy et al.
patent: 3738818 (1973-06-01), Stone et al.

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