Study On Magnetic Properties Of Core-shell Structure Nanoribbons

Because of its unique physical and chemical properties,nanoribbons have received great attention.Moreover,there is a great potential for development in many fields,such as magnetism,electronics,sensors,energy storage,biomedicine and so on.Therefore,it is of great significance to study the magnetic properties of nanoribbons.The microscopic theoretical model is established by effective field theory in this article.The effect of various on parameters on the magnetic properties of core-shell structure of square lattice nanoribbons and grapheme-like nanoribbons have been studied with exchange coupling and magnetic anisotropy.The magnetization of the square lattice core-shell structure not only appears there types Q,P,N,which is predicted Neels theory.The new type of curve has been found,namely two compensation points so on the magnetization.The magnetic susceptibility has the characteristics of the second order phase transition,and exhibits a singularity at the phase transition temperature.Due to the competition between the physical parameters of the system,the hysteresis loop of the system appears multi-loops due to the competition among the physical parameters.At low temperature,the system exist the plateaus on the magnetization curve.The number of the magnetization plateaus decrease with the increasing of the exchange coupling.The magnetization plateaus of the sublattice reversed with the increasing of external the magnetic field for appropriate physical parameters.The magnetization curves first reach maximum fall to constant with the increasing temperature of graphene nanoribbons.This is because of competition among physical parameters.Mutil-loops phenomenon are also found in hysteresis loop of the system.The multi-loop of hysteresis loop and the magnetization plateaus are also found in the core-shell structure of grapheme-like nanoribbons.