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采用经典XY模型 ,阐明了三角格子上层状超薄膜磁性材料的相变和临界现象 .并用Monte Carlo方法对该模型的内部能量、比热、chirality等热力学量进行了计算 .使用finite sizescaling分析法对临界现象的性质进行了论述 .通过上述分析和计算 ,发现该模型在反强磁性层与强磁性层内的chirality在一定范围内随温度的变化急剧增加 ,这是一种新的chirality相变 ;而在另一范围内存在Kosterliz Thouless相变和通常的chirality相变 .这种新的chirality相变的临界系数与系统层数增加无关 ,而通常的chirality相变的临界系数随系统层数增加而增加 .
The classical XY model was used to illustrate the phase transition and critical phenomena of the triangular lattice superlattice ultrathin film magnetic material. The Monte Carlo method was used to calculate the internal energy, specific heat, chirality and other thermodynamic quantities. Using finite sizescaling analysis The properties of the critical phenomena are discussed.According to the above analysis and calculation, it is found that the chirality in the anti-ferromagnetic and ferromagnetic layers increases sharply with temperature within a certain range, which is a new chirality phase transition , While in another range, Kosterliz Thouless phase transition and the usual chirality phase transition exist. The critical factor of this new chirality phase transition is independent of the increase of system layer number, and the critical factor of the usual chirality phase transition increases with the number of system layers Increase.