Temperature Dependent Magnetic Properties of KBiFe2O5

KBiFe2O5 is a room temperature multiferroic compound with promising dielectric, ferroic and photosensitive properties. It exhibits weak ferromagnetism. In this work we report the temperature dependent magnetic properties such as saturation magnetization, M-s, remnant magnetization, M-r, and coercivity H-c of KBiFe2O5 in a broad range of temperatures varying from 303 K to 823 K. The temperature dependence of coercivity was found to have considerable deviations from the Kneller's law whereas temperature dependent saturation magnetization showed excellent agreement with Bloch's law. The results are discussed in terms of inter-particle interaction induced by thermal fluctuation, size distribution of particles and disordered surface spins which influences the surface anisotropy.