Abstract
The magneto-optical Kerr rotation angle θK for polished bulk PtMnSb was found to show a great enhancement after annealing at temperatures higher than 400°C, although the change in the spectrum of reflectance R was very small. X-ray photoelectron spectroscopy analysis and the calculation of R and θK assuming the formation of overlayer revealed that the enhancement of θK was not attributable to the overlayer effect. It was found that the enhancement of θK was rather correlated with the change of magnetic anisotropy at the surface by annealing.
