A M ssbauer effect study, as the main key to the investigation of anomalous magnetic properties of MnZn nanoferrite

In this research, a low temperature in-field 57Fe M ssbauer spectroscopy is used for investigation of anomalous magnetic properties of MnZn nanoferrite. Based on M ssbauer spectroscopy results, the reduced saturation magnetization of MnZn nanoferrite in respect to that of bulk sample is due to nonequilibrium cation distribution and spin disorder. The enhanced Curie temperature of MnZn nanoferrite in respect to that of bulk sample can be attributed to the strengthening of the (A)-O-[B] superexchange interactions due to an increase of the magnetic ion concentration in the (A) site.