NiFe alloy electroplate manner and NiFe alloy electroplate film

摘要

PROBLEM TO BE SOLVED: To form an Fe-Ni alloy plating layer high in magnetic permeability and low in coercive force and anisotropic magnetic field by using a plating soln. of specified composition contg. Fe and Ni ions and conducting electrolysis at a specific current density. ;SOLUTION: A glass substrate sputtered with a permalloy as the plating substrate is clipped in a plating soln. contg. the Ni and Fe ions of nickel sulfate and ferrous sulfate, boric acid as a pH buffer, saccharine as a stress buffer and sodium lauryl sulfate as a surfactant, and a current is applied at 1-5mA/cm² and ON/OFF=2/1 sea pulse to electroplate the substrate. As a result, an Fe-Ni alloy having Fe/(Fe+Ni)=55±1% composition, 6.6×10^-6 saturation magnetostriction and 1-5μm thickness, with the crystal structure (100) oriented and excellent as a magnetic recording thin-film head is obtained on the substrate surface.;COPYRIGHT: (C)1998,JPO