Magnetic structures and magnetocrystalline anisotropy in bulk and thin film Fe3Pt

Magnetic structures and magnetocrystalline anisotropy (MCA) of tetragonal phase Fe3Pt with an L12 atomic ordering in bulk and thin film are investigated by means of the first-principles full-potential linearized augmented plane-wave method. The results obtained predict that the tetragonal phase, in which the tetragonal distortion with (c/a) = 0.95 makes an asymmetry of magnetic properties along the c-axis (out-of-plane) and a-axis (in-plane), has an out-of-plane MCA. In addition, from the thin film calculations, the presence of surface is found to strongly enhance the out-of-plane MCA.