Estimation of magnetocaloric properties by using Monte Carlo method for AMRR cycle
Estimation of magnetocaloric properties by using Monte Carlo method for AMRR cycle
复制标题
使用 AMRR 循环的蒙特卡罗方法估计磁热特性
DOI：
10.1088/1757-899x/101/1/012118
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and T Numazawa
中科院分区：
文献类型：
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作者：
R Arai;R Tamura;H Fukuda;J Li;A T Saito;S Kaji;H Nakagome;and T Numazawa
为了在磁制冷中实现较宽的制冷温度范围，将具有不同居里温度的多种材料分层是有效的。详细了解材料的物理特性对于优化材料选择和层状结构至关重要。在本研究中，我们基于Gd作为铁磁材料（一种典型的磁热材料），讨论了估计物理性质变化的方法，特别是当一些Gd原子替代非磁性元素进行材料设计时的居里温度。为此，我们在使用S= 7/2伊辛模型和蒙特卡罗方法进行计算的同时，对Gd-R合金（R= Y、Zr）进行了比热测量和磁化强度测量，以比较实验值和计算值。结果表明，利用蒙特卡罗方法可以很好地估计磁熵变、比热和居里温度。
In order to achieve a wide refrigerating temperature range in magnetic refrigeration, it is effective to layer multiple materials with different Curie temperatures. It is crucial to have a detailed understanding of physical properties of materials to optimize the material selection and the layered structure. In the present study, we discuss methods for estimating a change in physical properties, particularly the Curie temperature when some of the Gd atoms are substituted for non-magnetic elements for material design, based on Gd as a ferromagnetic material which is a typical magnetocaloric material. For this purpose, whilst making calculations using the S= 7/2 Ising model and the Monte Carlo method, we made a specific heat measurement and a magnetization measurement of Gd-R alloy (R= Y, Zr) to compare experimental values and calculated ones. The results showed that the magnetic entropy change, specific heat, and Curie temperature can be estimated with good accuracy using the Monte Carlo method.