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Spinel CoxZn1-xFe2O4 (x = 0, 0.2, 0.4, 0.6, 0.8) nanoparticles with sodium citrate as the surfactant were fabricated using the polyol process. The Co-substituted effect on the structure, morphology, magnetic and magnetocaloric properties of ZnFe2O4 ferrites were investigated with X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating-sample magnetometry (VSM). The results indicate that the Co-substituted ZnFe2O4 ferrites have a pure cubic spinel structure with a particle size of 6–9 nm. The CoxZn1-xFe2O4 particles exhibit ferromagnetic behavior with a small hysteresis at room temperature. An increase in the Co-content leads to an increase in the saturation-magnetization value (Ms). The Ms value is drastically raised to 44.26 emu/g. The temperature of CoxZn1-xFe2O4 in an alternating magnetic field is also increased with an increase in x. The final temperature of Co0.8Zn0.2Fe2O4 can reach 52 °C when the ferrite is placed in a magnetic field for 600 s, and the magnetocaloric effect is very significant.

Synthesis and magnetocaloric effect of Co-substituted ZnFe2O4 nanoparticles with polyol method