Study On Physical Properties Of Kekulene Structured Nanomaterials

Magnetic nanomaterials with Kekulene structure exhibit excellent physical and chemical properties due to their unique structural characteristics and large specific surface area,making them potentially promising for applications in magnetic refrigerant and battery anode materials.Therefore,a theoretical study of Kekulene can provide guidance for the application of magnetic nanomaterials.In this paper,the magnetic and thermodynamic properties of monolayer and bilayer Kekulene structured nanomaterials described by the mixed-spin Ising model are investigated based on the effective field theory with correlations.In the study of monolayer Kekulene structures,it was found that exchange coupling and anisotropy have an important influence on the magnetic and thermodynamic properties of the system.As the ferrimagnetic exchange coupling|J₁|increases,the saturation magnetization of the system decreases,the peak of the susceptibility curve and the peak of specific heat move towards the high temperature region,the phase transition temperature of the system increases,the internal energy decreases,the coercivity increases.As anisotropy|D₁|increases,the saturation magnetization of the system increases,the peak of the susceptibility curve and the peak of specific heat move towards the low temperature region,the phase transition temperature of the system decreases,the internal energy increases,the number of magnetization platforms and the number of hysteresis loops decreases.As anisotropy|D₂|increases,the saturation magnetization of the system decreases,the peak of the susceptibility curve and the peak of specific heat move towards the low temperature region,the phase transition temperature of the system decreases,the internal energy increases,the number of magnetization platforms and the number of hysteresis loops increases.In addition,the reentrant phenomenon is found in the phase diagram.In the study of the bilayer Kekulene structure,it was found that similar to the monolayer Kekulene structure,the magnetic and thermodynamic properties of the system are very sensitive to the exchange coupling and anisotropy.As the exchange coupling|J₁|(J₂)increases,the saturation magnetization of the system decreases,the peak of the susceptibility curve and the peak of specific heat move towards the high-temperature region,the phase transition temperature of the system increases,the internal energy decreases and the number of hysteresis loops increases.As anisotropy|D₁|(|D₂|)increases,the saturation magnetization of the system increases(decreases),the peak of the susceptibility curve and the peak of specific heat move towards the low-temperature region,the phase transition temperature of the system decreases,the internal energy increases,the number of magnetization platforms increases and the number of hysteresis loops first increases and then decreases(increases).The number of hysteresis loops increases and then decreases.In addition,the reentrant phenomenon has been observed in the phase diagram.The results of this paper support the future theoretical development and practical applications of Kekulene structured nanomaterials.