Structural and Magnetic Properties of Sr3-xLaxCo2Fe24O41 Hexaferrite

In the present work, La3+ ion substituted strontium Z-type hexaferrites (Sr3-xLaxCo2Fe24O41 (x = 0, 0.05, 0.10, 0.15, 0.20, and 0.25)) have been synthesized using solid-state reaction method. The effect of substitution on its structural and magnetic properties was investigated. X-ray diffraction (XRD) pattern confirms the formation of single-phase Z-type hexaferrite. The XPS spectra provide the evidence for formation of Fe2+ in La-substituted SrZ hexaferrites. FESEM micrographs of as prepared samples showed a reduction in grain size with the increasing La substitution. The behavior of substitution at various crystallographic sites was analyzed by Raman spectroscopy. The increase in saturation magnetization (Ms) and coercivity (Hc) was observed with increasing La content from x = 0 to x = 0.25.