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摘要

磁熵变（△SM）与磁场（0H）的相关性已在很多二级相变材料中被研究并报道，但一级相变材料的磁热效应与磁场相关性还少有报道.本文在具有一级磁结构相变的Mn0.6Fe0.4NiSi0.5Ge0.5材料中研究发现△SM与0H存在线性相关性，并通过麦克斯韦关系式的数值分析详细讨论了这一线性相关性的来源.同时，进一步发现在低磁场时，△SM近似正比于0H的平方.该线性相关性同样在一级磁结构相变Ni50Mn34Co2Sn14材料中得到了印证.但由于一级磁弹相变LaFe11.7Si1.3材料相变温度具有更强的磁场依赖性，不具有△SM的线性相关性，因此，本研究表明，当磁结构相变材料的相变温度具有弱磁场依赖性时，△SM与0H具有线性相关性.进而，在磁场未达到相变饱和磁场以下，利用△SM与0H的线性相关性可以有效推测更高磁场下的△SM.

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Abstract

The study on the field dependence of magnetocaloric effect (MCE) is considered to be of fundamental and practical importance, since it not only guides us in understanding and optimizing the MCE, but also helps us estimate the MCE for higher magnetic field which is not available in some laboratories. The magnetic field (0H) dependence of magnetic entropy change (△SM) has been studied extensively in many materials with second-order magnetic transition. However, the field dependence of MCE for first-order magnetic transition (FOMT) materials has not been sufficiently studied due to their complexity and diversity. In the present work, polycrystalline Mn0.6Fe0.4NiSi0.5Ge0.5, Ni50Mn34Co2Sn14, and LaFe11.7Si1.3 compounds with FOMT are prepared, and the magnetic and magnetocaloric properties are investigated systematically. In order to avoid a spurious △SM, the M-0H curves are measured in a loop process. The M-0H curves are corrected by taking into account the demagnetization effect, i.e. Hint=Hext-NdM. It is found that the -△SM follows a linear relationship -△SM=-△S0 +0H with the variation of magnetic field in Mn0.6Fe0.4NiSi0.5Ge0.5 compound when 0H 1 T. In addition, it is also noted that the △SM is approximately proportional to the square of 0H at low field. The origin of this linear relationship between △SM and 0H at high field and the deviation at low field are discussed by numerically analyzing the Maxwell relation. In addition to the △SM peak value, it is found that other △SM values at different temperatures also follow the linear relation at high field by performing the same numerical analysis. Moreover, it is found that the fitted △SM curve matches the experimental data very well. This result indicates that the linear relationship between △SM and 0H could be utilized to predict the △SM for higher magnetic field change when the field is lower than the saturation field. The applicability of this linear relationship is also verified in other systems with first-order magnetostructural transformation, such as Ni50Mn34Co2Sn14. However, it fails to describe the field dependence of △SM in LaFe11.7Si1.3, which exhibits a strong field dependence of transition temperature. Consequently, our study reveals that a linear dependence of △SM on 0H could occur in magnetostructural transition materials, which show the field independence of transition temperature.

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通信作者:张虎,zhanghu@ustb.edu.cn

基金项目:国家自然科学基金（批准号：51671022，51701130）、国家重点研发计划（批准号：2017YFB0702704）、北京市自然科学基金（批准号：2162022）和佛山市科技计划（批准号：2015IT100044）资助的课题.

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Corresponding author:Zhang Hu,zhanghu@ustb.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 51671022, 51701130), the National Key Research and Development Program of China (Grant No. 2017YFB0702704), the Natural Science Foundation of Beijing, China (Grant No. 2162022), and the Scientific and Technological Innovation Team Program of Foshan, China (Grant No. 2015IT100044).

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Linear dependence of magnetocaloric effect on magnetic field in Mn0.6Fe0.4NiSi0.5Ge0.5 and Ni50Mn34Co2Sn14 with first-order magnetostructural transformation

摘要

Abstract

作者及机构信息

1.
2.
3.
4.

通信作者:张虎,zhanghu@ustb.edu.cn

Authors and contacts

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3.
4.

Corresponding author:Zhang Hu,zhanghu@ustb.edu.cn

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Linear dependence of magnetocaloric effect on magnetic field in Mn0.6Fe0.4NiSi0.5Ge0.5 and Ni50Mn34Co2Sn14 with first-order magnetostructural transformation

摘要

Abstract

作者及机构信息

1.2.3.4.

通信作者:张虎,zhanghu@ustb.edu.cn

Authors and contacts

1.2.3.4.

Corresponding author:Zhang Hu,zhanghu@ustb.edu.cn

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