Abstract
This work focuses on the microstructure, magnetic properties and magnetocaloric effect of CoFe2O4 (CFO) nanoparticles elaborated by the sol–gel auto combustion method. The XRD investigation indicates that CFO is crystallized in a cubic spinel structure with the Fd3¯m space group and the SEM micrograph shows fine quasi-spherical nanoparticles with an average grain size of 160 nm. The temperature dependence of the Raman spectra reveals the ferromagnetic to paramagnetic conversion started from 723 K. The magnetization temperature dependence reveals the Curie temperature at TC = 785 K. Large value of magnetocaloric temperature change of ΔT = 11.2 K with a high RCP of 687.56 J Kg−1 were measured indirectly via the Maxwell approach making our CFO nanopowder suitable candidate for both environmentally friendly magnetic refrigeration and medical applications at ambient temperature.
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