Electro-deposition of a nonmagnetic conductive coating for memory wire protection

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a magnetic memory cell having a protective overcoating which is both nonmagnetic and electrically conductive.
A further object is to provide a magnetic memory cell having a hard, noncorrosive protective coating which may be applied at room temperature and which is amenable to bonding through conventional soldering techniques.
In accordance with the invention, a plated memory wire is provided with an electro-deposited layer of nickel-phosphorous alloy.
The protective alloy layer has a phosphorous content of approximately 15% and thus exhibits nonmagnetic properties while retaining good electrical conductivity.
The layer is applied by submerging the wire in an electrolyte having a nickel ion to hypophosphite ion molar ratio of approximately three to one and a pH of between 2.
5 and 3.
75.
These and other objects, features and advantages will be made apparent by the following detailed description of a preferred embodiment of the invention, the description being supplemented by drawings as follows.