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

The magnetic anisotropy constants of Fe
₃
Pt 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 Fe
₃
Pt alloy thin films depends on the substrate. The magnetic anisotropy constants of each oriented Fe
₃
Pt alloy thin films are found to be structure sensitive. The temperature dependence of the magnetic anisotropy constants and magnetization of the Fe
₃
Pt alloy thin films were examined. The dependence for Fe
₃
Pt alloy thin films between the magnetic anisotropy constants and magnetization is consistent with the theoretical prediction of M
²
for the two-ion model put forward for the case of the Fe
₅₀
Pt
₅₀
alloy.