Magneto-Optical Spectra of MnAs on GaAs Grown by HWE

Abstract

Ferromagnetic MnAs thin films were grown on GaAs(100) and (111)B substrates by the atomic-hydrogen-assisted hot-wall epitaxy technique, using polycrystalline powder of MnAs as evaporation source. The source and substrate temperatures were 700°C and 400°C, respectively. The surface orientations of the MnAs films grown on (100) GaAs substrates (1011) and (1012), (111)B GaAs was (0001). The polar magneto-optical Kerr rotation and ellipticity spectra and reflectivity spectrum were measured in the films. The dielectric permeability spectra were calculated from experimental data, from which the magneto-optical spectra were analyzed.