First-principles study on the relationship between magnetic anisotropy and anomalous Hall effect of bct-Fe_(50)Co_(50)

摘要

We studied quantitative relationship between the intrinsic anomalous Hall conductivity (σ_(xy)) and the uniaxial magnetic anisotropy constant (K_u) of bct-Fe_(50)Co_(50) using first-principles calculation because these quantities originate from spin-orbit interaction. We found that the obtained σ_(xy) and K_u with changing the axial ratio c/a (1 ≤ c/a ≤ 2~(1/2)) exhibit similar behavior mainly arising from the common band mixing of the minority-spin d_(xy) and d_(x~2-y~2) states near the Fermi level which is sensitive to c/a.