The Magnetic properties of Mn_(0.3)Mg_(0.2)Zno.5Fe_2O_4 and Mn_(0.3)Mg_(0.2)Co_(0.5)Fe_2O_4:The effect of milling

摘要

Mn_(0.3)Mg_(0.2)Zn_(0.5)Fe_204 and Mn_(0.3)Mg_(0.2)Co_(0.5)Fe_2O_4 nanoparticles with particle diameters of about 13 nm were synthesized by glycol-thermal method. The as-prepared specimens were then milled at different times up to 50 h and the single phase spinel structure confirmed by X-ray diffraction. The properties for the as-prepared and milled samples for the two systems were deduced and contrasted. Significant changes induced by milling in particle size, magnetization, coercive field and hyperfine parameters are reported. ~(57)Fe M?ssbauer spectra at room temperature show ordered magnetic spin states in both Mno.3Mgo._2Zno.5Fe_20_4 and Mno.3Mg_(0.2)Co_(0.5)Fe_2O_4 by magnetization measurements.