Unexpectedly Large Magnetic Anisotropy of Fe $_{3}$ Pt Alloy Thin Films With Various Crystallographycal Orientations

The magnetic anisotropy constants of Fe ₃Pt alloy thin films fabricated by e-beam evaporation onto MgO (100), (111), and (110) substrates held at various deposition temperatures were investigated in conjunction with structure. It is observed that the orientation of the Fe₃Pt alloy thin films depends on the substrate. The magnetic anisotropy constants of each oriented Fe ₃Pt alloy thin films are found to be structure sensitive. The temperature dependence of the magnetic anisotropy constants and magnetization of the Fe₃Pt alloy thin films were examined. The dependence for Fe₃Pt alloy thin films between the magnetic anisotropy constants and magnetization is consistent with the theoretical prediction of M² for the two-ion model put forward for the case of the Fe₅₀Pt₅₀ alloy.