journal article·2023-03Open access

Significant Unconventional Anomalous Hall Effect in Heavy Metal/Antiferromagnetic Insulator Heterostructures

Yuhan Liang, Liang Wu, Minyi Dai, Yujun Zhang, Qinghua Zhang, Jie Wang, Nian Zhang, Wei Xu, Le Zhao, Hetian Chen, Ji Ma, Jialu Wu, Yanwei Cao, Di Yi, Jing Ma, Wanjun Jiang, Jia‐Mian Hu, Ce‐Wen Nan, Yuan‐Hua Lin

Advanced Science· Volume 10· Issue 8

Abstract

Abstract The anomalous Hall effect (AHE) is a quantum coherent transport phenomenon that conventionally vanishes at elevated temperatures because of thermal dephasing. Therefore, it is puzzling that the AHE can survive in heavy metal (HM)/antiferromagnetic (AFM) insulator (AFMI) heterostructures at high temperatures yet disappears at low temperatures. In this paper, an unconventional high‐temperature AHE in HM/AFMI is observed only around the Néel temperature of AFM, with large anomalous Hall resistivity up to 40 nΩ cm is reported. This mechanism is attributed to the emergence of a noncollinear AFM spin texture with a non‐zero net topological charge. Atomistic spin dynamics simulation shows that such a unique spin texture can be stabilized by the subtle interplay among the collinear AFM exchange coupling, interfacial Dyzaloshinski–Moriya interaction, thermal fluctuation, and bias magnetic field.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: Magnetic properties of thin films · Physics of Superconductivity and Magnetism · Theoretical and Computational Physics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering Tsinghua University Beijing 100084 China

Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming Yunnan 650093 China

Department of Materials Science and Engineering University of Wisconsin‐Madison Madison WI 53706 USA

Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

Institute of Physics Chinese Academy of Sciences Beijing 100049 China

State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

CAS Center for Excellence in Superconducting Electronics (CENSE) Chinese Academy of Sciences Shanghai 200050 China

Department of Physics Tsinghua University Beijing 10084 China

Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo Zhejiang 315021 China

Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China

Funding

National Natural Science Foundation of China · National Science Foundation

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