Enhanced Relative cooling Power and large inverse magnetocaloric effect of cobalt ferrite nanoparticles synthesized by auto-combustion method

This work focuses on the microstructure, magnetic properties and magnetocaloric effect of CoFe$_2$O$_4$ (CFO) nanoparticles elaborated by sol-gel auto combustion method. The XRD investigation indicates that CFO is crystallized in a cubic spinel structure SEM micrograph shows fine quasi-spherical with an average grain sizes 160 nm. temperature dependence Raman spectra reveals ferromagnetic to paramagnetic (FM-PM) transition started from 723 K magnetization versus measurements Curie located at T$_{\rm C}$ = 785 K. Large value change $\Delta$T =11.2 high RCP 687.56 J Kg$^{-1}$ are achieved indirectly via Maxwell approach making our nanopowder suitable candidate for both environmentally friendly refrigeration medical applications ambient temperature.