The variation of magnetic anisotropy K with magnetization M in metallic ferromagnets was investigated using relativistic electronic structure theory of finite temperature metallic magnetism. This theory was applied to the high uniaxial K material, L10-ordered FePt, and its magnetic easy axis perpendicular to the Fe/Pt layers for all M and K to be proportional to M 2 for a broad range of values of M was also found. The results show that at low temperatures in the single-ion model, the magnetocrystalline anisotropy (MCA) falls off much more quickly as the temperature is increased and the overall magnetization is reduced.
ASJC Scopus subject areas
- Physics and Astronomy(all)