Anisotropy of crystalline ferromagnets with defects

作者：Cullen J^*; Zhao P; Wuttig M

来源：Journal of Applied Physics, 2007, 101(12): 123922.

DOI：10.1063/1.2749471

This letter describes a model of the anisotropy of crystalline ferromagnetic alloys containing defect clusters. The focus is on < 100 >-type pairs in bcc lattices each of which is assigned a uniaxial anisotropy of fixed magnitude. The lattice is also characterized by a coherent anisotropy energy due to the transition element host lattice as well as an isotropic exchange and magnetic dipole energy. This model is applied to a study of the concentration dependence of the fourfold magnetic anisotropy K-eff(C) of quenched bcc Fe1-CGaC alloys. It yields K-eff(C)proportional to 1-kappa C-4 which gives a good account of the dependence of K-eff on C. In particular, it accounts for the collapse of K-eff at C approximate to 0.2, provided the magnitude of the local anisotropy energy is three orders of magnitude larger than that of the coherent fourfold anisotropy energy.

• 出版日期2007-6-15