Abstract
The magneto-optical Kerr rotation angle θk. for a polished surface of bulk PtMnSb was measured at 632.8 nm in high magnetic fields. The saturation value of θk 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 θk is caused by the decrease in the imaginary part of the diagonal element of dielectric constant. It was also found that θk depends strongly on the composition in the Pt-Mn-Sb ternary system and takes a maximum at the stoichiometric composition.
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