Experimental and theoretical study of the interplay between magnetic, magnetothermal and structural properties of magnesium ferrite particles

We present the results of experimental and theoretical studies of interplay between magnetic, magnetothermal and structural properties of magnesium ferrite particles (MgFe2O4) which have the favorable magnetic properties for hyperthermia applications both by themselves and as a component of the composites. The combination of theoretical and experimental methods of research allows with high accuracy to study dimensional, structural and magnetic parameters of the ferrite particles. To reveal particle's size and structure peculiarity influence on the magnetic properties of the fine magnesium ferrite its particles were obtained by sol-gels, reverse co-precipitation, and ceramics solid reaction methods. The influence of synthesis parameters on purity, dimension, cation distribution was characterized by Mo<spacing diaeresis>ssbauer spectroscopy. The degree of inversion in the synthesized ferrites determined from Mo<spacing diaeresis>ssbauer spectra was between 0.77 and 0.95. The theoretical study based on the DFT method revealed strong dependence of magnetic properties of ferrite particles on degree of inversion due to changes of electronic structure of the system. The obtained demonstrate that the choice of synthesis method determines possibility correlations between magnetic properties and particle's dimensions, and fine crystal structure.