The apparatus for measurement of magnetooptical spectra using a polarization modulation technique has been improved to extend the short-wavelength limit to about 200 nm in the ultraviolet range. Short-wavelength characteristics of the light source, the focusing system including mirrors and lenses, the monochromator, the polarizer and the analyzer were improved. The techniques of calibration for Kerr rotation and ellipticity were also refined. With the use of the newly designed system, the magnetooptical Kerr rotation and Kerr ellipticity of FePt/Pt multilayers, as well as of FePt alloys of different compositions were evaluated for photon energies between 1.2 and 5.9 eV.
Abstract-Magnetooptical spectra have been studied for photon energies between 1.2 and 6.4 eV in bulk crystals ofundoped and Pt-doped MnSb. Kerr rotation ofundoped crystals showed a prominent zero-crossing behavior around 4.5 eV. The zerocrossing energy moved to 4.1 eV in Pt-doped samples, which were explained by the averaged spectra of separated two phases. ofMnSb and PtMnSb.
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