Magneto-Optical Spectra of Pt-Doped MnSb Bulk Crystals

Polycrystalline bulk crystals of MnSb were prepared by the normal freezing method, while single crystals of MnSb and bulk crystals of Pt-doped MnSb were prepared by the Bridgman technique. The magneto-optical (MO) spectra of these samples were measured between 1.24 and 6.35 eV. The Kerr rotation spectra of polycrystalline MnSb showed a new peak around 6 eV, which is larger than for lower energies. The spectra of single crystals of MnSb were strongly dependence on their crystal orientation. XRD measurement and an area analysis of EPMA revealed that Pt-doped MnSb grown in the equilibrium condition was characterized by a phase separation into MnSb and PtMnSb. The shape of the MO spectra of Pt-doped MnSb was slightly different from that of undoped MnSb.