Magnetic properties of Sn-substituted NiZn ferrite thin films

Sn-substituted NiZn ferrite thin films, Ni0.5+xSnxZn0.5Fe2−2xO4 (0⩽x⩽0.2), were synthesized by a sol–gel method. The crystallographic and magnetic properties of Ni0.5+xSnxZn0.5Fe2−2xO4 thin films have been investigated. The diffraction peak shifted towards the lower angle and the lattice parameter increased with Sn substitution. Both grain size and surface roughness of the thin films with Sn substitution were bigger than those of the film without substitution. Hysteresis loops of thin films demonstrated that the Sn-substituted films were more easily saturated than that of the film without substitution. Saturation magnetization (Ms) of thin films decreased with increasing Sn substitution, however, coercivity (Hc) changed contrarily.