The relationship between the asymmetric magnetoresistive effect and the magnetocaloric effect in Ni43Co7Mn39−xCrxSn11 Heusler alloys

Yunli Xu; Dongchao Yang; Linjie Ding; Lizhi Yi; Shuaiwei Fan; Liqing Pan; Jia Li; Fengxia Hu; Guanghua Yu; John Q. Xiao

doi:10.1039/C9CP00145J

The relationship between the asymmetric magnetoresistive effect and the magnetocaloric effect in Ni₄₃Co₇Mn_39−xCr_xSn₁₁ Heusler alloys†

Yunli Xu,

^a Dongchao Yang,^a Linjie Ding,^a Lizhi Yi,^a Shuaiwei Fan,^a Liqing Pan,

*^a Jia Li,^b Fengxia Hu,

^b Guanghua Yu^c and John Q. Xiao

*^d

Author affiliations

* Corresponding authors

^a Research Institute for Magnetoelectronics & Weak Magnetic-Field Detection, College of Science, China Three Gorges University, Yichang 443002, China
E-mail: lpan@ctgu.edu.cn

^b State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Science, Beijing 100190, China

^c School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

^d Department of Physics and Astronomy, University of Delaware, Newark, DE, USA
E-mail: jqx@udel.edu

Abstract

The correlation between the magnetocaloric effect and magnetotransport property was investigated in Ni₄₃Co₇Mn_39−xCr_xSn₁₁ Heusler alloys. The asymmetric isothermal-magnetoresistance around the phase transformation temperature was observed, from which a parameter γ, determined as the ratio of the asymmetric magnetoresistance to the temperature coefficient of resistance, is proposed. According to Maxwell's equation, the parameter γ is analyzed to be equivalent to the transformation temperature change induced by a magnetic field in martensitic transformation. This finding is confirmed by experimental results. In addition, the γ values can be used to estimate the magnetic entropy change of the martensitic transformation directly without measuring the comprehensive temperature dependence of magnetization curves.

Physical Chemistry Chemical Physics

The relationship between the asymmetric magnetoresistive effect and the magnetocaloric effect in Ni₄₃Co₇Mn_39−xCr_xSn₁₁ Heusler alloys†

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The relationship between the asymmetric magnetoresistive effect and the magnetocaloric effect in Ni₄₃Co₇Mn_39−xCr_xSn₁₁ Heusler alloys

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Physical Chemistry Chemical Physics