Magnetic properties and photo-induced effect of ZnO-Fe₂O₃ system oxides thin film

Abstract

50ZnO·50Fe₂O₃ crystallized thin film, which was prepared by sputtering method showed cluster-glass-like magnetic properties. At room temperature this film is ferromagnetic, whose origin is presumed to be cation site-exchange between Fe and Zn. On the other hand, the temperature dependence of magnetization showed an interesting behavior, divergence in two cooling process, FC and ZFC at 275K. This illustrates that the system contains some meta-stable spin states which is frozen below the temperature (so it is named spin-freezing temperature T_f). T_f also showed its dependence of AC-magnetic field frequency. Amorphous film containing Bi₂O₃ showed similar properties.