Tunable interface anisotropy in Pt/Co_1-xFe_x/Pt multilayer

Interfacial magnetic anisotropy in Pt/Co_1-xFe_x/Pt multilayer is tuned by doping iron atoms into cobalt layer. The perpendicular magnetic anisotropy and out-of-plane coercivity are found to decrease with x increasing. For a specific x, the out-of-plane coercivity acquires a maximal value as a function of the CoFe layer thickness. At low temperature, the coercivity is enhanced. Small coercivity but reasonably large perpendicular magnetic anisotropy can be obtained by controlling x and CoFe layer thickness.