Magnetic Properties and Magnetic Hyperthermia of Cobalt Ferrite Nanoparticles Synthesized by Hydrothermal Method

Cobalt ferrite magnetic nanoparticles were synthesized through a hydrothermal route at various reaction temperatures: 100 °C, 130 °C, 160 °C, and 190 °C in order to study their hyperthermia potential. The heating properties of these samples were investigated by measuring time-dependent temperature curves in an external magnetic field (200 kHz, 100 Oe). Magnetic properties validated by cation distribution through octahedral and tetrahedral sites of the spinel structure done by the MAUD program. The results showed that temperature rising leads to migration of cobalt ions from octahedral to the tetrahedral site leading to change the reverse spinel structure to mixed structure. It was found that the nanoparticles synthesized at 160 °C reaction temperature had the maximum specific absorption rate (SAR) and intrinsic loss power parameter (ILP), as well as the highest saturation magnetization (M_s) and lowest coercivity (H_c) value.