Evidences of thermoelectrically driven unidirectional magnetoresistance from a single Weyl ferromagnet Co2MnGa

doi:10.1063/5.0176508

	Evidences of thermoelectrically driven unidirectional magnetoresistance from a single Weyl ferromagnet Co2MnGa
	Rong, Bin1,2 ; Ren, Lizhu 3; Liu, Yizhe 4; Sun, Bo 4; Chen, Jiaxin 5; Teo, Kie Leong 3; Liu, Liang 5,6; Yang, Yumeng1,2
	2023-12-01
发表期刊	APL MATERIALS
EISSN	2166-532X
卷号	11 期号:12
DOI	10.1063/5.0176508
摘要	Weyl ferromagnets, with large anomalous Hall (and Nernst) effects, are an ideal playground to study unconventional transport phenomena. Here, we report a sizable unidirectional magnetoresistance with a ratio of up to 7.73 × 10−5 per current density of 1 MA cm−2 in single-layer epitaxial Co2MnGa films. Surprisingly, the nonlinear signal has an isotropic crystallographic axis dependence and scales almost linearly with the film thickness. Both features cannot be explained by the spin transport from an intrinsic band structure, but rather agree with the current induced transverse thermoelectric effect. By employing a 1D heat transfer model to account for the temperature gradient, we derived an analytical expression of this thermoelectrically driven unidirectional magnetoresistance, from which a upper bound of transverse thermopower Sxy = 3.70 ± 1.10 µV K−1 can be obtained. Our work provides direct evidences of thermoelectric voltages in the nonlinear transport signals that may be extended to other material systems as well. © 2023 Author(s).
关键词	Cobalt alloys Ferromagnetic materials Ferromagnetism Gallium alloys Heat transfer Magnetoresistance Superconducting materials Ternary alloys Thermoelectricity Anomalous hall effects Crystallographic axes Ferromagnets Film-thickness Isotropics Nernst effect Nonlinear signals Single layer Spin transport Transport phenomenon
URL	查看原文
收录类别	EI
语种	英语
出版者	American Institute of Physics Inc.
EI入藏号	20235115254012
EI主题词	Manganese alloys
EI分类号	543.2 Manganese and Alloys ; 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals ; 641.2 Heat Transfer ; 701.1 Electricity: Basic Concepts and Phenomena ; 701.2 Magnetism: Basic Concepts and Phenomena ; 708.3 Superconducting Materials ; 708.4 Magnetic Materials
原始文献类型	Journal article (JA)
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/347974
专题	信息科学与技术学院信息科学与技术学院_博士生信息科学与技术学院_PI研究组_杨雨梦组
通讯作者	Yang, Yumeng
作者单位	1.School of Information Science and Technology, ShanghaiTech University, Shanghai; 201210, China; 2.Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore; 3.Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen; 518055, China; 4.Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Tsung-Dao Lee Institute, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai; 200240, China; 5.Hefei National Laboratory, Hefei; 230088, China; 6.Shanghai Research Center for Quantum Sciences, 99 Xiupu Road, Shanghai; 201315, China
第一作者单位	信息科学与技术学院
通讯作者单位	信息科学与技术学院
第一作者的第一单位	信息科学与技术学院
推荐引用方式 GB/T 7714	Rong, Bin,Ren, Lizhu,Liu, Yizhe,et al. Evidences of thermoelectrically driven unidirectional magnetoresistance from a single Weyl ferromagnet Co2MnGa[J]. APL MATERIALS,2023,11(12).
APA	Rong, Bin.,Ren, Lizhu.,Liu, Yizhe.,Sun, Bo.,Chen, Jiaxin.,...&Yang, Yumeng.(2023).Evidences of thermoelectrically driven unidirectional magnetoresistance from a single Weyl ferromagnet Co2MnGa.APL MATERIALS,11(12).
MLA	Rong, Bin,et al."Evidences of thermoelectrically driven unidirectional magnetoresistance from a single Weyl ferromagnet Co2MnGa".APL MATERIALS 11.12(2023).