A Study of Magnetic Properties of Manganite Substituted ZnFe2O4 Composites

Composites of ZnFe 2 O 4 /La 0.67 Sr 0.33 MnO 3 with different weight percentages were synthesized using sol-gel method and their magnetic behavior was investigated. Powder X-ray diffraction studies show spinel structure for zinc ferrite and rhombohedral for La 0.67 Sr 0.33 MnO 3 . An additional minor phase of α −Fe 2 O 3 and ZnO was also noticed in zinc ferrite suggesting non-stoichiometric nature. Fourier transform infrared spectroscopy studies display cohabitation of two phases belonging to ferrite and perovskite phase with varying peak intensities. Field-dependent magnetization measurement at room temperature shows partial variation in saturation magnetization and remanent magnetization values with increase in La 0.67 Sr 0.33 MnO 3 weight percent in zinc ferrite. Except for zinc ferrite, d M d H shows single peak with smooth variation, pointing to easy rotation of magnetic dipoles under applied fields.