Effect of substrate temperature on magnetic properties of strontium ferrite thin films

Strontium hexagonal ferrite (SrM) thin films were prepared by a dc magnetron sputtering system, and the crystal structure and magnetic properties were studied. It was found that crystallization temperature of SrM film was around 500/spl deg/C. Preferential orientation of c-axis was observed at the substrate temperature (Ts) of 550/spl deg/C. The films prepared at Ts of 550/spl deg/C exhibited the maximum coercivity of 3.5 kOe in the perpendicular direction.