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A combined investigation of the magnetization, Faraday rotation, polar Kerr rotation and the X-ray photoelectron spectroscopy of two Co-and Ti-substituted hexagonal ferrite films, prepared by pulsed laser ablation deposition, was made. The investigation indicates .he presence of a certain amount of three valent cobalt ions within the majority of two valent cobalt states. KEYWORDS: HEXAGONAL FERRITES, PHOTOELECTRON SPECTROSCOPY. HYSTERESIS CURVES. z. Simsa, et a1.: MAGNETO•OPTICALAND XPS SPECTRA OF COBALT AND TITANIUM SUBSTITUTED HEXAFERRITE FILMS Applied field (Ot'