Magnetic and heating rate properties of Mn1-xCoxFe2O4 nanoparticles synthesized by coprecipitation method

In this work, Mn1-xCoxFe2O4 (x=0, 0.1, 0.2, 0.3, 0.4 and 0.5) nanoparticles have been prepared by coprecipitation method. The effects of Co2 substitution on the cation distribution between tetrahedral and octahedral sites in spinel structure, magnetic properties and AC magnetically induced heating characteristics were investigated. The structure and cation distribution characterized by X-ray diffraction and Raman spectroscopy showed the substituted Co2 cations mainly entered to octahedral sites. The particle size of the as-coprecipitated powders observed by scanning electron microscopy decreased with cobalt additions. Magnetic properties of Mn1-xCoxFe2O4 nanoparticles studied by vibrating sample magnetometry showed the highest coercivity and saturation magnetization of 790 Oe and 32.8 emu/g for Mn0.7Co0.3Fe2O4 nanoparticles, respectively. The Mn0.7Co0.3Fe2O4 nanoparticles exhibited the AC heating temperature of 8 °C and specific loss power of 1.4 W/g in comparison with 4 °C and 0.35 W/g for the as-coprecipitated MnFe2O4 powders.