Abstract

A spin-1/2, Ising trilayered ferrimagnetic system on square Bravais lattice is studied, employing Monte-Carlo simulation with the single spin-flip Metropolis algorithm. The bulk of such a system is formed by three layers, each of which is composed entirely either by A or B type of atoms, resulting in two distinct compositions: ABA and AAB and two different types of magnetic interactions: ferromagnetic between like atoms and antiferromagnetic between unlike atoms. For such systems, Inverse Absolute of Reduced Residual Magnetisation is the absolute value of the ratio of the extremum of the magnetisation in between compensation and critical points and the saturation magnetisation. Variation of relative interaction strengths in the Hamiltonian, for a range of values, leads to the shift of compensation point and critical point and changes in the magnitude of inverse absolute of reduced residual magnetisation. Probable mathematical forms of dependences of the inverse absolute of reduced residual magnetisation and temperature interval between the critical and compensation temperatures on controlling parameters are proposed in the absence of applied magnetic field and have obtained phase diagrams for both types of configurations from these relations. This alternative description of the simulated systems may help technologists design magnetocaloric materials according to desired characteristics.

Graphic abstract

中文翻译：

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自旋1/2 Ising方形三层中磁热量的热力学行为

摘要

研究了正方形Bravais晶格上自旋1/2的Ising三层亚铁磁系统，并使用Monte-Carlo模拟和单自旋翻转Metropolis算法进行了研究。这种系统的主体由三层组成，每一层完全由A或B型原子组成，导致两种截然不同的组成：ABA和AAB以及两种不同类型的磁相互作用：相似原子之间的铁磁和反铁磁在不同原子之间。对于此类系统，剩余磁化强度的反绝对值是补偿和临界点之间的磁化强度极值与饱和磁化强度之比的绝对值。对于一定范围的值，哈密顿量中相对相互作用强度的变化，导致补偿点和临界点的偏移，以及剩余磁化强度降低的反绝对值的变化。在没有施加磁场的情况下，提出了可能的数学形式，其表示减小的剩余磁化强度的逆绝对值以及临界温度和补偿温度之间的温度间隔对控制参数的依赖性，并从这些关系中获得了两种配置的相图。模拟系统的这种替代描述可以帮助技术人员根据所需特性设计磁热材料。在没有施加磁场的情况下，提出了可能的数学形式，其表示减小的剩余磁化强度的逆绝对值以及临界温度和补偿温度之间的温度间隔对控制参数的依赖性，并从这些关系中获得了两种配置的相图。模拟系统的这种替代描述可以帮助技术人员根据所需特性设计磁热材料。在没有施加磁场的情况下，提出了可能的数学形式，其表示减小的剩余磁化强度的逆绝对值以及临界温度和补偿温度之间的温度间隔对控制参数的依赖性，并从这些关系中获得了两种配置的相图。模拟系统的这种替代描述可以帮助技术人员根据所需特性设计磁热材料。

图形摘要