https://doi.org/10.1140/epjp/s13360-023-03811-x
Regular Article
Study of magnetocaloric effect and magnetic properties of the nano-graphene bilayer with RKKY interactions of a mixed spins S = 3/2 and σ = 3: a Monte Carlo simulation
Laboratory of Solid Physics, Faculty of Sciences Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, Box 1796, Fez, Morocco
Received:
28
December
2022
Accepted:
15
February
2023
Published online:
13
March
2023
In this study, we have used Monte Carlo simulations that explain the magnetic properties and magnetocaloric effect of a nano-graphene bilayer separated by non-magnetic layers with mixed spin 3/2 and 3 with RKKY (Ruderman-Kittel-Kasuya-Yosida) exchange coupling. We present and discuss ground state phase diagrams that have been found. Also, the reduced critical temperature is obtained for several values of the number of non-magnetic layers (NM). The system can exhibit a phase transition from the ferromagnetic to the paramagnetic phase at a reduced critical temperature. The effect of the parameter NM, the reduced exchange interactions (S–S), (σ−σ), and the reduced crystal field on the total magnetizations and the established hysteresis loops are investigated. Specific heat, specific heat change, thermal magnetization dM/dT, and magnetic entropy changes as a function of the temperature for various reduced external magnetic fields were investigated in detail. Finally, we report the influence of different values of reduced magnetic field 
on the relative cooling power.
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