Preparation of CoZn-ferrite thin films and their magneto-optic properties

Transparent Co-ferrite and CoZn-ferrite thin films were prepared using a vacuum evaporation followed by a heat treatment. The Faraday rotation and absorption spectra of the films were measured and the difference was discussed considering the preferential occupation of Zn²⁺ions on the tetrahedral sites in the spinel structure[1]. Apparent differences were observed in the Faraday rotation and absorption spectra in the wavelength ranges from 600nm to 800nm and 1400nm to 1800nm. The Faraday rotation spectrum of Co-ferrite was compared with that of Co²⁺doped GdIG[2], and the similarity of the profile of the -θFof Co-ferrite and that of the θFof Co²⁺doped GdIG was pointed out. It is suggested that the difference in the sign of θFis based on the different polarity of the magnetic moments of the Co²⁺ions on the tetrahedral sites in both structures.