Study On Physical Properties Of Surface-Decorated Graphene-Like And Graphdiyne-Like Nanomaterials

Due to the unique structures,graphene-like and graphyne-like exhibited many excellent physical properties,they had great application prospects in functional materials,aerospace,information,and energy.In this paper,the magnetic and thermodynamic properties of surface-decorated graphene-like and graphdiyne-like nanomaterials were investigated by using the Ising model combined with Monte Carlo simulation.The results had guiding significance in experimental preparation and practical application.In the study,the results showed that the ferromagnetic exchange coupling J₁of surface-decorated graphene-like materials had an important influence on the magnetic and thermodynamic properties of the system.With the increase of J₁,the greater the thermal disturbance was required for the phase transition of the internal lattice point in the system.Meanwhile,the higher the blocking temperature,the saturation magnetic field and the coercivity of the system also increased.With the increase of ferromagnetic exchange coupling|J₂|,the peak of the susceptibility curve moved to the high-temperature region,which improved the blocking temperature,reduced the internal energy,and increased the number of magnetization platforms and hysteresis loops.At the same time,the increase of the intensity of the external magnetic field would also make the blocking temperature of the system rising.In the study of surface-decorated graphdiyne-like,it was found that the increase of ferromagnetic exchange coupling J₁could change the magnetic ion spin of each part,resulting in the change of saturation magnetization of the system.The peak value of magnetic susceptibility and specific heat moved to the high-temperature region,which hindered the temperature rising,the internal energy gradually decreased,and the number of magnetization platforms was also changed.The increase of ferromagnetic exchange coupling|J₂|is similar to the effect of the increase of J₁on the system,but the control ability of the system was smaller than J₁.The increase of anisotropy|D₁|,|D₂|,|D₃|and|D₄|could make saturation magnetization in the system change,and the peak of susceptibility and specific heat was moved to the low-temperature area,which could hinder the decrease of blocking temperature and increase of internal energy.The increase of the absolute value of anisotropy could change the number of magnetization platforms,and the saturation magnetic field would increase.