Calculating the magnetocaloric effect in second-order-type material by micromagnetic simulations: A case study on Co2B

Calculating the magnetocaloric effect in second-order-type material by micromagnetic simulations: A case study on Co2B
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通过微磁模拟计算二阶材料的磁热效应:以 Co2B 为例

DOI:
10.1016/j.scriptamat.2019.10.039
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发表时间:
2020-03
期刊:
影响因子:
6
通讯作者:
Bai-Xiang Xu
Bai-Xiang Xu
中科院分区:
材料科学1区
文献类型:
--
作者:
Dominik Ohmer;Min Yi;Maximilian Fries;Oliver Gutfleisch;Bai-Xiang Xu

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提出了一种结合微磁学模拟和Arrott-Noakes方程的计算方案,用于研究二阶磁相变材料的微结构和磁晶各向异性对磁热效应的影响.使用Arrott-Noakes方程,微磁模拟结果外推到居里温度以上的温度,并应用于MCE计算。以Co2 B为模型材料,我们发现磁晶各向异性的增加有利于更高的等温熵变(Δ ST).晶粒尺寸的减小使饱和磁化强度(MS)不变时的Δ ST增大,而随着晶粒尺寸的减小,饱和磁化强度(MS)减小时的Δ ST减小。
We propose a calculation scheme which integrates micromagnetic simulations and the Arrott–Noakes equation for the investigation of the influence of microstructure and magnetocrystalline anisotropy on the magnetocaloric effect (MCE) in second-order magnetic phase transition materials. Using the Arrott–Noakes equation, the micromagnetic simulation results are extrapolated to temperatures above Curie temperature and applied to MCE calculations. With Co 2 B as model material, we found that increasing magnetocrystalline anisotropy facilitates higher isothermal entropy changes (Δ S T). The grain size reduction results in increased Δ S T for constant saturation magnetization (M S), while Δ S T decreases for a reduction of M S with reduced grain size.
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