Electrodeposited Co-Pt Thin Films with High Coercivity

Co-Pt alloy film magnets were prepared by electrodeposition. After annealing as-deposited films with face-centerd-cubic (fcc) crystal stracture, the structure of films with 24-50 at.% Co content transformed from disordered fcc phase to ordered face-centered-tetragonal (fct) L1₀ phase. It was clarified that Co-Pt film magnets with the Co content of 43 at. % have high coercivity of approximately 880 kA/m.