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

Youness Hadouch (1, 2) , Daoud Mezzane (1, 2) , M'Barek Amjoud , Lahoucine Hajji (3) , Yaovi Gagou (2) , Zdravko Kutnjak (4) , Valentin Laguta (5, 6) , Yakov Kopelevich , Mimoun El Marssi (2)

1 IMED-Lab - Laboratoire des Matériaux Innovants, Energie et Développement Durable [Marrakech]
2 LPMC - Laboratoire de Physique de la Matière Condensée - UR UPJV 2081
3 UCA - Université Cadi Ayyad [Marrakech]
4 IJS - Jozef Stefan Institute [Ljubljana]
5 Institute for Problems of Material Science
6 Institute of Physics ASCR

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 Fd 3 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 AT = 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 ap-plications at ambient temperature.

Mots clés: Cobalt ferrite; Sol-gel self-combustion; Nanoparticles; First order; Magnetocaloric effect; Relative Cooling Power

Domaines: Physique [physics]; Matière Condensée [cond-mat]

Youness Hadouch, Daoud Mezzane, M'Barek Amjoud, Lahoucine Hajji, Yaovi Gagou, et al.. Enhanced Relative cooling Power and large inverse magnetocaloric effect of cobalt ferrite nanoparticles synthesized by auto-combustion method. Journal of Magnetism and Magnetic Materials, 2022, 563, pp.169925. ⟨10.1016/j.jmmm.2022.169925⟩. ⟨hal-03856432⟩