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 Ms=71.9 emu/g and Hc=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.
Kang et al. (Tue,) studied this question.