C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/26.5
C25D 3/56 (2006.01)
Patent
CA 1159792
MAGNETOSTRICTIVE ALLOY THIN FILM ELECTROPLATING METHOD Abstract of the Disclosure A thin film of low magnetostriction Permalloy* 80% nickel - 20% iron + 1% is electroplated onto a substrate in a bath having a ratio of from 5.8:1 to 23:1 ratio of Ni to Fe ions with a plating current density from 10 ma/cm2 - 200 ma/cm2 when plating in sheet form or an Ni/Fe ratio of from 25:1 to 86:1 with a current density of from 2 ma/cm2 - 60 ma/cm2 when plating through a mask. The fluid in the system is constantly mixed, replenished with fresh iron, acid, and other reagents, is adjusted in temperature and subjected to a continuous laminar regime of mixing. The Fe++ ion concentration required is inverse to the circulation of bath fluid across the substrate. Fresh solution is added to the bath from a reservoir where the above adjustments are made. The inlet for the fresh solution is at the lower end of the plating chamber and directed at a bath mixer which includes a slot through which the fresh solu- tion is directed to optimize mixing in the plating chamber. Complexing agents are avoided. High speed plating is obtained with about 24.4 g/l of Ni++, 1.05 g/l of Fe , 25 g/l of H3BO3, 0.2 g/l of Na saccharin and a pH of 1.5 to 3.6. * Trade Mark
410149
Castellani Eugene E.
Powers John V.
Romankiw Lubomyr T.
Barrett B.p.
International Business Machines Corporation
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