Electrochemical preparation and magnetic study of Bi–Fe–Co–Ni–Mn high entropy alloy

A facile and efficient synthesis route for the preparation of Bi–Fe–Co–Ni–Mn high entropy alloy films has been firstly reported in this work. The surface of the film is close-grained and the nanorods with high aspect ratios can be obtained by potentiostatic electrodeposition in the DMF (N,N-dimethylformamide)–CH₃CN organic system. The effects of the deposition potential and the molar ratio of Bi(III) to transition metal ions (TMs(II)) in the organic system on the contents of Bi in the HE alloy were investigated. The annealed alloy structure is composed mainly of face-centered-cubic solid solution. The as-deposited alloys show soft magnetic behavior, and the annealed alloys exhibit hard magnetic properties.