Investigation of Magnetometry and Hyperthermia Properties of Stable Magnetite Nanoparticle Suspension UNIMAG

The hyperthermal and magnetic properties of a stable magnetic suspension of magnetite nanoparticles have been studied. To this end, we have developed a low-frequency generator, 300 W, 300 kHz for hyperthermia application. A sample of magnetic suspension was placed in an induction coil and heated to 55°C for 30 minutes. Based on the results of measurements of the transverse susceptibility using radio-frequency resonant magnetometery, it can be concluded that the suspension was superparamagnetic at room temperature and transferred to the magnetic state at nitrogen temperature. Comparing the obtained experimental results with the literature data, we estimated the average size of nanoparticles, which was about 10 nm. Evaluation by computer simulation using the Tikhonov regularization method based on the magnetization curve gives similar results.