▎ 摘　　要

By using Monte Carlo simulations, we investigated a triangle double-layer graphene nanoisland with mixed-spin (3/2, 2) configuration. We focused on the effects of crystal-fields, exchange couplings, longitudinal magnetic fields, and temperature on the magnetic properties of the system. Various curves of magnetization, susceptibility, and internal energy as a function of temperature were obtained. We plotted the phase diagrams of blocking temperature in the different parameter planes. We found that increasing |J(ab)/J(Z)|,J(bb)/J(Z), andh/J(Z)or weakening |D-b/J(Z)| is beneficial to improving theT(B)/J(Z), but theT(B)/J(Z)is very insensitive to changes in theD(a)/J(Z)andJ(aa)/J(Z). In addition, it is worth noting that the system can exhibit abundant multiple-loops hysteresis behaviors for certain physical parameters, such as triple, quadruple, quintuple, septuple hysteresis loops.