Effect of composition and crystallinity of epitaxial Ni-Zn ferrite films by pulsed laser deposition on their magnetic properties

Abstract

Epitaxial (Ni-Zn)Fe2O4 thin film was prepared on Si (001) substrates using (MgO-Al2O3)/CeO2/YSZ triple buffer layer. In this work, to increase remanent magnetization (Mr) and decrease coercive field (Hc), for epitaxial (Ni-Zn)Fe2O4 thin film, the effect of substrate temperature, oxygen pressure and composition on the magnetic properties was examined. It was clarified that the remanent magnetization and coercive field were strongly influenced by temperature and oxygen pressure. In order to obtain high Mr and low Hc, it was thought that a substrate temperature of 800°C and oxygen pressure 1.3 Pa were optimal conditions. As regarding the composition, Mr could be obtained to a maximum of 3.96 × 10-1 Wb/m2 by changing the quantity of Zn and Fe (Ms = 5.31 × 10-1 Wb/m2, Hc = 1.35 × 101 kA/m).