Double switching hysteresis loop in a single layer Fe3Pt alloy thin films

The Fe3Pt alloy thin films were epitaxially grown on MgO(100) substrate by e-beam evaporation. The films were partially ordered at the substrate deposition temperature above 350 °C. These partially ordered films exhibit very large biaxial magnetic anisotropy constant in the order of 105 J/m3 and produce double switching in the hysteresis loops. The difference of the switching field of these films can be up to about 3 × 105 A/m by tuning the angle of the applied field with respect to the easy axes. This double switching behavior stems from the large biaxial magnetic anisotropy of the films.