Ab initio calculated magneto-optical spectra of half-metallic ferromagnets

Within the density-functional theory approach we have carried out fully relativistic calculations of the conductivity tensor, the Kerr rotation and ellipticity for PtMnSb, PdMnSb and NiMnSb compounds. Our calculations successfully reproduced the huge Kerr effect for PtMnSb and give the correct positions of the main features for the other compounds. The origins of the main peculiarities are discussed.