| Summary: | Zn<sub>0.6</sub>Mg<sub>0.4</sub>Cr<sub>x</sub>Fe<sub>2−x</sub>O<sub>4</sub> (0 ≤ x ≤ 0.4) nanoparticles were synthesized using a hydrothermal technique. The obtained magnetic nanoparticles (MNPs) exhibited a spinel structure, where the lattice constant decreased with the Cr<sup>3+</sup> ion content. The doping of Cr<sup>3+</sup> ion (x = 0.1) increased the specific saturation magnetization to 46.4 emu/g but decreased to 20.0 emu/g with the further increase in the Cr<sup>3+</sup> ion content to x = 0.4. The decrement in Curie temperature was ascribed to the weakened super-exchange interaction between the metal ions located at <i>A</i>-sites and <i>B</i>-sites, which arose from the doping of the Cr<sup>3+</sup> ion. The T<sub>2</sub>-weighted images gradually darkened with the increase in Zn<sub>0.6</sub>Mg<sub>0.4</sub>Cr<sub>0.1</sub>Fe<sub>1.9</sub>O<sub>4</sub> nanoparticles concentration, suggesting that the nanoparticles can enhance the image contrast. Zn<sub>0.6</sub>Mg<sub>0.4</sub>Cr<sub>x</sub>Fe<sub>2−x</sub>O<sub>4</sub> (0 ≤ x ≤ 0.4) nanoparticles were able to heat the agar phantom to the hyperthermia temperature under the safe alternating magnetic field, which showed their potential in the magnetic induction hyperthermia.
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