COMPLEX POLAR KERR SPECTRA IN AMORPHOUS Tb-Fe FILMS

The complex polar magneto-optic Kerr spectra at the photon energy range 1.5 to 5.2 eV in amorphous TbxFe1-x films with 0.15 ≤ x ≤ 0.23 rf sputtered onto water cooled glass substrates and covered by Al2O3 layer, are presented. They extend the previously published data to higher photon energies where the combined effects of the enhancement by the Al2O3 and the oxide layer created at the metal dielectric interface and those of 4f-5d electronic transitions of terbium become important. An explanation of the spectra is proposed based on the knowledge of the Tb effect in iron garnets.