Eur. Phys. J. Plus (2021) 136: 926
https://doi.org/10.1140/epjp/s13360-021-01916-9

Regular Article

Monte Carlo study of magnetic properties and magnetocaloric effect in a molecular-based magnet ${\mathrm{AFe}}^{\mathrm{II}}{\mathrm{Fe}}^{\mathrm{III}}{({\mathrm{C}}_2{\mathrm{O}}_4)}_3$ nanographene

¹ ERMAM, Polydisciplinary Faculty of Ouarzazate, Ibn Zohr University, Box 638, Ouarzazate, Morocco
² Physics of Materials and Systems Modeling Laboratory (PMSML), Unit Associated at CNRST-URAC: 08, Faculty of Sciences, Moulay Ismail University, B.P. 11201, Zitoune, Meknes, Morocco

^a b.boughazi@uiz.ac.ma, brahim.boughazi@gmail.com

Received: 15 June 2021
Accepted: 26 August 2021
Published online: 9 September 2021

Abstract

In this work, the magnetic behavior and magnetocaloric effect of a ferromagnetic mixed spin (5/2, 2) Ising system (${\mathrm{AFe}}^{\mathrm{II}}{\mathrm{Fe}}^{\mathrm{III}}{({\mathrm{C}}_2{\mathrm{O}}_4)}_3$) on a nanographene single layer have been investigated by the use of Monte Carlo simulation. We have first studied the magnetic behavior which, by increasing the exchange couplings and the applied magnetic field, can be enhanced. Then, the influences of these last two parameters, on the magnetic entropy change $\mathrm{\Delta }{S}_{\mathrm{m}}$, the adiabatic temperature change $\mathrm{\Delta }{T}_{\mathrm{ad}}$ and the relative cooling power (RCP) have been examined. The value of $\mathrm{\Delta }{S}_{\mathrm{m}}$ and $\mathrm{\Delta }{T}_{\mathrm{ad}}$ maximums, which appear at the critical temperature, increases with increasing the applied magnetic field or decreasing exchange couplings. By increasing the external magnetic field, the relative cooling power (RCP) increases while it decreases with the temperature.