Some factors controlling the uniformity and properties of NiFe plated wires

The changes in composition of NiFe for a change in flow, temperature, or current in the NiFe electrolyte are determined. The local uniformity of composition is controlled by varying these coefficients of composition through changes in the Ni⁺⁺concentration and temperature of deposition. At low concentrations of Ni⁺⁺and low temperatures, it is concluded that a local, or short-term, fluctuation in flow is the principal factor affecting the uniformity of the NiFe composition deposited, At higher Ni⁺⁺concentrations the temperature fluctuations become the principal factor affecting the uniformity. The trends in magnetic properties and memory quality are also related t o t h e Ni⁺⁺concentration and temperature of deposition. These trends are interpreted in terms of the model previously described for the origin of the nondestructive read-out properties of plated wire.