Magnetic and Mössbauer Spectroscopy of Co/MgFe2O4 Spinel

The study of spinel ferrite ion sites is an important aspect to optimize its structure. In this report, homogeneous and stable mixed spinels CoFe 2 O 4 and MgFe 2 O 4 were synthesized by a simple sol–gel combustion method. The Curie temperature is higher than 400 K, so the Mössbauer spectrum at room temperature shows a typical magnetically ordered Zeeman sextet. The change in the hyperfine magnetic field is consistent with the change in the saturation magnetization, which can be explained by the change in the superexchange contribution between each point. The frozen magnetic moment at low temperature makes CoFe 2 O 4 appear partly independent of antiferromagnetic domain contribution. The competitive ability of the ion to the B site is Mg 2+  > Co 2+  > Fe 3+ , which will provide some guidance for the structural optimization of spinel ferrite.