Hyperthermia application of zinc doped nickel ferrite nanoparticles

This work was written with the aim of preparing zinc doped nickel ferrite (Ni1-xZnxFe2O4: x = 0.25, x = 0.5 and x = 0.75) nanoparticles via mechanical milling and subsequent sintering. The mobility of Zn2+ ions within the lattice structure of NiFe2O4 ferrite with an inverse spinel structure was investigated and the resultant magnetic properties were discussed. Variation of magnetization of Ni1-xZnxFe2O4 (x = 0.25, x = 0.5 and x = 0.75) under a DC magnetic field was studied and the obtained results were used to justify the initial heating rate of the samples under an AC magnetic field. According to the results, the Brown effect, as a heating mechanism in soft ferromagnetic and super paramagnetic materials, did not have a decisive role in the heat release of magnetic nanoparticles. In return, the Néel effect was consistently more active as a result of increasing the zinc content. The aggregate analysis showed that the saturation magnetization played the most important role in the minimum value of the specific absorption rate of Ni0.25Zn0.75Fe2O4 samples.