Synthesis and magnetic properties of ferrites spinels Mg xCu 1− xFe 2O 4

Abstract

Polycrystalline Mg 0.6Cu 0.4Fe 2O 4 ferrites have been prepared using solid-state reaction technique. Their structural and magnetic properties have been studied, using X-ray diffraction and magnetic measurements. Using mean field theory and high-temperature series expansions (HTSE), extrapolated with the padé approximants method, the magnetic properties of Mg 1− x Cu x Fe 2O 4 have been studied. The nearest neighbor super-exchange interactions for intra-site and inter-site of the Mg 1− x Cu x Fe 2O 4 ferrites spinels, in the range 0≤ x≤1, have been computed using the probability approach, based on Mössbauer data. The Curie temperature T c is calculated as a function of Mg concentration. The obtained theoretical results are in good agreement with experimental ones obtained by magnetic measurements.