ホイスラー合金 PtMnSb における磁気カー効果の強磁場特性と組成依存性

抄録

The magneto-optical Kerr rotation angle θ_k. for a polished surface of bulk PtMnSb was measured at 632.8 nm in high magnetic fields. The saturation value of θ_k for the stoichiometric sample was 1.42° in the as-polished state, and it was enhanced to 1.75° by annealing at temperatures higher than 400°C It is suggested that the enhancement of θ_k is caused by the decrease in the imaginary part of the diagonal element of dielectric constant. It was also found that θ_k depends strongly on the composition in the Pt-Mn-Sb ternary system and takes a maximum at the stoichiometric composition.