Correlation of magnetocrystalline anisotropy of Fe_0.5Pd_0.5alloy with chemical order

Abstract

We study the magnetocrystalline anisotropy of Fe0.5Pd0.5 alloy using the first-principles spin-polarized relativistic Korringa-Kohn-Rostoker coherent-potential approximation. We investigate the effect of long-ranged chemical order on the magnitude as well as the direction of easy magnetization. We find that in this alloy, the chemical order enhances the magnitude of the magnetocrystalline anisotropy energy as well as altering the easy axis. In particular, for the L10 ordered alloy the easy axis is perpendicular to the alternating layers of Fe and Pd with quite large magnetocrystalline anisotropy energy 124 µeV. These observations are in very good agreement with experiments. We also find that it is the electronic structure in the vicinity of the Fermi surface that is responsible for this effect.

Spin-polarised currents and magnetic domain walls

“…(At present we will restrict our discussion to results for FePd, although we will examine some results from FePt in §4.3.3.) This lattice structure results in a very strong uniaxial magnetocrystalline anisotropy along the tetragonal axis, normal to the planes of atoms [234,235]. Such materials can be grown Figure 18: Spin orientation of two ferromagnetic chains with antiferromagnetic coupling at an atomically sharp boundary subject to a magnetic field.…”