| 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/cm<2> 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.
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