▎ 摘　　要

The magnetic and magnetocaloric properties of the nano-graphene monolayer structure consisting of mixed spins S = 3/2 and sigma = 2 are studied by using Monte Carlo simulations. The ground-state phase diagrams corresponding to several physical parameters are first discussed. The influence of the number of lattice sites on the total and partial magnetizations and the magnetic susceptibilities has been investigated. The critical temperature is deduced. The effect of exchange interaction, external magnetic, and crystal field on total magnetizations is studied. Magnetic hysteresis cycles are obtained. Specific heat change and magnetic entropy changes are inferred for several magnetic fields. Finally, the relative cooling power is determined.