Effects of spin fluctuation on the magnetic anisotropy constant of itinerant electron magnets

Abstract

In the disordered local moment picture, we calculated the magnetization (M) and magnetic anisotropy energy (MAE) of FePt, CoPt, and MnAl ordered alloys and body-centered tegragonal FeCo (bct-FeCo) disordered alloy, assuming spatially fluctuated spin configurations at finite temperatures. All alloys exhibit the relation K1(T)/K1(0)=(M(T)/M(0))^n with the exponent (n) around 2. This is consistent with the two-ion anisotropy model, in contrast to the usual single-ion anisotropy model exhibiting n=3. Because these systems have different mechanisms of MAE, we suggest that this relation is a general rule for itinerant electron systems.

11 pages, 5 figures

References in corpus (1)

• Degree of order dependence on magnetocrystalline anisotropy in bct FeCo alloys

Cited by in corpus (4)

• Monte Carlo analysis for finite temperature magnetism of Nd${}_2$Fe${}_{14}$B permanent magnet
• The influence of anti-site defects and stacking faults on the magneto crystalline anisotropy of FePt
• Temperature Dependence of Magnetocrystalline Anisotropy in Itinerant Ferromagnets
• Theoretical Study of Temperature Dependence of Spin Susceptibility in Anisotropic Itinerant Ferromagnets