Mn0.5Zn0.5Fe2O4 nanoparticles with high intrinsic loss power for hyperthermia therapy

Nanosized mixed ferrite Mn0.5Zn0.5Fe2O4 with crystalline size ∼15 nm has been prepared by hydrothermal route. XRD patterns confirm that the crystallites have single phase cubic spinel structure. The dynamic scaling analysis on the frequency dependence of spin glass-like transition temperature well explains the model of a transition at finite temperature. The analysis gives critical exponent and parameters as: zν = 10.48, T0 = 190 K, f0 = 5.38 × 1010 and this confirms the occurrence of spin glass-like transition in Mn0.5Zn0.5Fe2O4 particles. The saturation magnetization and the coercivity change with temperature. The effective magnetic anisotropy constant of sample was calculated using the law of approach to saturation. The coercivity at different temperatures was deduced using the mixed coercivity model. The calculated coercivity results are in a good agreement with the experimental ones. The magnetic heating ability of Mn0.5Zn0.5Fe2O4 magnetic fluid was studied with an induction heating system. The calculated intrinsic loss power (ILP) was 3.75 g nHm2/kg. This study indicates that the resulting Mn0.5Zn0.5Fe2O4 nanoparticles are promising materials in magnetic hyperthermia.