The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 25, 1978
Filed:
Dec. 30, 1976
Eugene Evans Castellani, Putnam Valley, NY (US);
John Vincent Powers, Shenorock, NY (US);
Lubomyr Taras Romankiw, Briarcliff Manor, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A thin film of low magnetostriction Permalloy 80% nickel - 20% iron .+-. 1% is electroplated in a bath having a ratio of about 1.8:1 to 24:1 g/liter ratio of Ni to Fe ions with a plating current density from 10 ma/cm.sup.2 - 200 ma/cm.sup.2 when plating in sheet form or an Ni/Fe ratio of 25:1 to 85:1 with a current density of 2 ma/cm.sup.2 - 110 ma/cm.sup.2 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. 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 solution 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.sup.++, 1.05 g/l of Fe.sup.++, 25 g/l of H.sub.3 BO.sub.3, 0.2 g/l of Na saccharin and a pH of 1.5 to 3.6.