Influence of electroplating conditions on magnetic properties of Fe-36wt. % Ni alloy film

A Fe-Ni soft magnetic film was prepared in sulphate solution by electroplating. The influences of the molar ratio of n [Fe2+]/n [Ni2+], current density, bath temperature, pH and L-ascorbic acid concentration on magnetic properties of Fe-Ni alloy film were investigated. The results show that the saturated flux density (BS) of the film increases initially and decreases after it reaches the specific value with the increase of n [Fe2+]/n [Ni2+] molar ratio, current density, bath temperature and pH. However, the relationship between L-ascorbic acid concentration and Bs keeps linear. It is observed that the coercive force (Hc) is enhanced with the increase of n [Fe2+]/n [Ni2+] molar ratio, current density and pH. By comparison, when the bath temperature increases, Hc always decreases. With the increase of L-ascorbic acid concentration, the coercive force increases initially and then decreases.