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The magnetic behaviors and magnetocaloric effect of a nano-graphene bilayer: A Monte Carlo study
Micro and Nanostructures ( IF 3.1 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.spmi.2020.106775
Lei Sun , Wei Wang , Cong Liu , Bing-hui Xu , Dan Lv , Zhong-yue Gao

Abstract By means of the Monte Carlo simulation, the influence of exchange couplings and the applied magnetic field on the magnetic behaviors and magnetocaloric effect of a ferromagnetic mixed-spin (3/2, 5/2) nano-graphene bilayer have been investigated. It is found that the magnetic behaviors can be enhanced by increasing the exchange couplings and the applied magnetic field. The internal energy decreases with increasing two physical parameters mentioned above. In addition, the maximums of the magnetic entropy change and adiabatic temperature change would appear near the critical temperature, the values of them increase with decreasing exchange couplings or increasing the applied magnetic field. The maximum of the -ΔSm can be found to be 0.293 for h= 3. Besides, the relative cooling power can be enhanced as the exchange couplings decrease or the applied magnetic field increases.

中文翻译:

纳米石墨烯双层的磁行为和磁热效应:蒙特卡罗研究

摘要 通过蒙特卡罗模拟,研究了交换耦合和外加磁场对铁磁混合自旋(3/2、5/2)纳米石墨烯双层的磁行为和磁热效应的影响。发现可以通过增加交换耦合和施加的磁场来增强磁性行为。内能随着上述两个物理参数的增加而降低。此外,磁熵变和绝热温度变化的最大值会出现在临界温度附近,它们的值随着交换耦合的减少或外加磁场的增加而增加。可以发现 -ΔSm 的最大值在 h=3 时为 0.293。此外,
更新日期:2021-01-01
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