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

Abstract

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 Zn <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> 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 Co <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> doped GdIG[2], and the similarity of the profile of the -θ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">F</inf> of Co-ferrite and that of the θ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">F</inf> of Co <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> doped GdIG was pointed out. It is suggested that the difference in the sign of θ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">F</inf> is based on the different polarity of the magnetic moments of the Co <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> ions on the tetrahedral sites in both structures.