Magnetic properties of BaM∕Pd–Pt double-layered thin film deposited at various substrate temperatures

Crystallographic and magnetic properties of barium ferrite (BaM) thin films deposited onto Pt, Pd, and an alloy of Pd–Pt underlayers by sputtering at different substrate temperatures (Ts) from 400to600°C have been studied. It is found that the coercivity values in the perpendicular direction (Hcperp) of the BaM∕Pd–Pt films are higher than those of the BaM films deposited on Pd and Pt underlayers. C-axis orientation of BaM∕Pd–Pt film can be achieved at very low Ts of 450°C with a Hcperp of 2.1kOe for 30-nm BaM.