Temperature dependent magnetic studies of Ba_0.5Sr_0.5Co_0.2Fe_11.8O₁₉ prepared by solid state reaction method

Abstract

Ba0.5Sr0.5Co0.2Fe11.8O19 was synthesized using solid state reaction method. Lattice parameters ‘a’ and ‘c’ were found to be 5.886 Å and 23.110 Å respectively. Scanning electron microscopy studies showed platelet type structures in the sample and the elemental mapping showed the uniform distribution of cations throughout the sample. The spontaneous magnetization (Ms) of 62 emu/g with coercivity (Hc) of 1.22 kOe was observed at 300K. The Ms value increased whereas the Hc decreased with the decreasing measurement temperature. The highest Ms value of 88 emu/g was observed at 60K. Curie temperature of 819 K was observed for the sample. The anisotropy constant (K1) and anisotropy field (Ha) were found to be increased with the decrease in measurement temperature. The observed magnetic behaviour can be explained on the basis of distribution of cations in the lattice sites and shape anisotropy of the prepared sample.