Magnetic Studies on CoFe2O4Thin Films Prepared by Spin Coating Method

Abstract

Cobalt ferrite thin films were prepared by sol gel spin coating method. The effect of annealing temperature and film thickness on structural and magnetic properties was investigated. The chosen annealing temperature were 700 °C, 800 °C, 900 °C, 1000 °C and film thickness were varied from 0.40 μm to 0.70μm. As the annealing temperature increased the coercivity decreased. Saturation magnetization increased with increasing annealing temperature. At 1000 °C film showed relatively high saturation magnetization (284.5emu/cc) and low coercivity (293.5Oe). The magnetic hysteresis loops for perpendicular and parallel to the planes of substrate are same. The surface morphology investigated by field emission scanning electron microscope for films fabricated at different temperature and different thickness.