Magnetic and Hyperthermia Properties of Co<sub>x</sub>Fe<sub>3-x</sub>O₄ (x=0.2, 0.4, 0.6, 0.8, 1.0)

Nanoparticle samples CoxFe3-xO4 (x=0.2, 0.4, 0.6, 0.8, 1.0) are manufactured using high temperature thermal decomposition (HTTD) method. Each sample is confirmed to have a single structural phase with a group of Fd-3m spaces by Rietveld refinement of the XRD diffraction spectra. The lattice constant increases linearly from 8.3759 Å for x=0.2, to 8.3965 Å for x=1.0. Through the VSM experiment, magnetic properties are verified by measuring magnetization and coercive force up to 15 kOe at room temperature. For x=0.8 samples, the saturation magnetization and coercive force field are M_s=71.9 emu/g and H_c=40.5 Oe, respectively. The hyperthermia test results show that the self-heating temperature of the sample x=0.8 was 63.7 °C under an alternating magnetic f ield of 250 Oe at 112 kHz. Successf ul superpar amagnetic nanoparticles with doping fabrication can achieve high magnetization but low coercivity, which is suitable for hyperthermia.