OPTICAL AND MAGNETOOPTICAL PROPERTIES OF CO-TI-SUBSTITUTED BARIUM HEXAFERRITE SINGLE-CRYSTALS AND THIN-FILMS PRODUCED BY LASER-ABLATION DEPOSITION

Ellipsometry, reflectance photometry and Kerr polarimetry have been us ed to determine the optical and magneto-optical properties of bulk sin gle-crystal platelets and thin films of Co-Ti-doped barium hexaferrite . The single crystals were grown by a slow-cooling flux method and the thin films were produced by pulsed laser ablation deposition onto sin gle-crystal Al2O3 substrates at 840-degrees-C. The complex refractive index (n) and magneto-optic Voigt parameter (Q) were determined over t he spectral range 350-850 nm and the reliability of the data tested by comparison with photometric measurements of reflectance. Although the optical constants of the thin films could not readily be obtained ove r the entire spectral range by ellipsometry, their magneto-optical per formance in terms of the Kerr rotation and ellipticity compared well w ith predictions based on the fundamental data for the bulk material.