The Mn—Zn ferrite nanoparticles (CoxMn0.5Zn 0.5-xFe2O4, X = 0, 0.03, 0.12, 0.24, and 0.34) were prepared by a microemulsion technique and characterized by energy dispersive spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), etc. The XRD patterns indicate the presence of single-phase spinel ferrite in the samples. The particle size was estimated by the XRD method as well as from the micrograph taken by SEM. The magnetic properties of the samples were studied by VSM that showed superparamagnetic behaviors. Doping Co into the Mn—Zn ferrite can yield these superparamagnetic nanoparticles with narrow distribution of particle size so that their magnetic properties are improved.
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