Preparation of Soft Magnetic Films by Electroless Ni-Fe-P Plating

Abstract

Soft magnetic films useful in computer memory application as the undercoating of perpendicular recording madia were prepared by electroless Ni-Fe-P plating, and optimum plating conditions were investigated in terms of the relation of plating conditions to solution stability and the composition and magnetic properties of the films.
Stable conditions for electroless Ni-Fe-P plating were obtained in caustic alkaline solutions including ammonium sulfate. Fe-rich films (about 20wt% Fe) with low coercive force (H_c) could be plated from these solutions at relatively high rate.