journal article·2026-02

Multi‐Origin Driven Giant Planar Hall Effect in Topological Antiferromagnet EuAl 2 Si 2 with Tunable Spin Texture

Xiangqi Liu, Ziyi Zhu, Yixuan Luo, Zhengyang Li, Jingcheng Huang, Bo Bai, Xia Wang, Chuanying Xi, Li Pi, Guanxiang Du, Leiming Chen, Wenbo Wang, Wei Xia, Yanfeng Guo

Advanced Functional Materials· Volume 36· Issue 14
Publisher page

Abstract

Abstract In topological materials, the planar Hall effect (PHE) is often regarded as a hallmark of profound quantum phenomena—most notably the Adler‐Bell‐Jackiw chiral anomaly and Berry curvature—rendering it an indispensable tool for deciphering the topological essence of emergent phases. In this study, the PHE and anisotropic magnetoresistance (MR) is delved into the recently discovered layered topological antiferromagnet EuAl 2 Si 2 . The analysis of the robust PHE signal (≈3.8 µΩ cm at 2 K and 8 T) unveils a distinct interplay of mechanisms. While Berry curvature plays a minor role, the dominant contributions stem from classical orbital MR in the field‐induced ferromagnetic state and field‐suppressed spin fluctuations in the paramagnetic regime. These insights not only position EuAl 2 Si 2 —with its highly tunable spin texture—as an exemplary system for probing the intricate coupling between spin configurations and band topology in magnetotransport but also pave the way for designing novel materials with tailored PHE responses, highlighting significant application prospects in quantum sensing, spintronic devices, and topologically protected electronic systems.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Chemical and Physical Properties of Materials · Rare-earth and actinide compounds

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

Affiliations

State Key Laboratory of Quantum Functional Materials School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China

Henan Key Laboratory of Aeronautical Materials and Application Technology Zhengzhou University of Aeronautics Zhengzhou Henan 450046 China

College of Telecommunication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China

ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai 201210 China

Analytical Instrumentation Center School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China

Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei Anhui 230031 China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China

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