Magnetic Properties of a Nano-graphene Monolayer with Higher-Order Exchange Interaction Coupling
Using the Monte Carlo simulation, we have studied the phase diagrams and the hysteresis behaviors of a single layer Ising nanographene with next-nearest neighbors coupling J 2 and four-spin interaction J 4 in the presence of a crystal field D and applied magnetic field h. It can emphasize that, for appropriate system parameters, the nanographene can exhibit a new phenomenon manifested in the emergence of an antiferromagnetic phase sandwiched between two ferromagnetic ones. Concerning the hysteresis behavior, the system can present a multiple hysteresis loops.
KeywordsMonte Carlo simulation Nanographene Phase diagrams Hysteresis behaviors
This work has been initiated with the support of URAC: 08 and the project PPR: (MESRSFC-CNRST).