Preparation and soft-magnetic properties of Fe-Co-Ni-Cr plated films having a single phase structure and high saturation magnetization.

Abstract

The preparation method and softmagnetic properties of electrodeposited Fe-Co-Ni-Cr alloy film having high saturation magnetization and single phase structure were investigated. It was found that Fe-Co-Ni-Cr alloy film having a single phase fcc structure can be electrodeposited at the cathode in a solution composed of Fe2+, Co2+, Ni2+, Cr3+ ions and SO42- ions as count anion by plating under a condition of the current density more than 30 mA/cm2. The film composed of Fe44Co17Ni36Cr3 alloy prepared by the plating method described in this paper has the soft-magnetic properties (μiHA>1500, HcHA< 0.5 Oe, λs=6 × 10-6 Bs= 16800 Gauss) applicable for HDD thin film magnetic head cores.