Magnetic anisotropy field H and domain structure in L10 Fe Pt1− films

Abstract Anisotropy fields Hk of L10 FexPt1−x films have been evaluated from the magnetization curves using Stoner–Wohlfarth model and are 40∼80 kOe in x=0.45∼0.6. Domain structures observed by MFM at demagnetized state are composed of bright, dark and intermediate contrast areas. The bright and dark contrast corresponds to the surface magnetic charges originated from magnetization perpendicular to the film surface.