一维钻石链反铁磁Ising模型磁化的模拟

Magnetic Properties of One-dimensional Antiferromagnetic Ising Diamond Chain

采用Monte Carlo模拟方法对自旋为1/2的一维钻石链反铁磁Ising系统的磁化行为进行研究.在这个系统中,反铁磁的交换作用和三角结构导致存在自旋阻挫.重点研究不同的反铁磁自旋交换作用对系统磁行为和自旋构型的影响.模拟磁化曲线中M=MS/3磁化平台,得到平台宽度随不同的自旋交换相互作用强弱的变化关系,以及出现磁化平台时格点的自旋构型;给出亚稳态存在的条件及亚稳态时的微观构型.研究磁滞回线随温度的变化关系.结果表明,随着温度的升高,磁滞回线逐渐减小,最终消失.

Monte Carlo method is used to study magnetic properties of S = 1 /2 one-dimensional antiferromagnetic Ising diamond chain.In this system,due to antiferromagnetic interactions and trigonal structure,there exists spin frustration.The magnetic behaviors and spin configurations of the system are investigated with different antiferromagnetic interactions.Magnetization plateaus at M = MS /3 are obtained in process of magnetization.Width of plateau exhibits variously for different antiferromangnetic interactions.Spin configurations are presented in the magnetization process as there appears the M = MS /3 plateau and the system lies in a metastable state.Consequently,conditions in which the metastable state appears are concluded.In addition,hysteresis loops of the system are studied in different temperatures.With increase of temperature the hysteresis loops become more and more unobvious,and finally disappear.