journal article·2025-01Open access

Unconventional Anomalous Hall Effect Driven by Self‐Intercalation in Covalent 2D Magnet Cr2Te3

Keke He, Mengying Bian, Samuel D. Seddon, Koushik Jagadish, Andrea Mucchietto, He Ren, Erik Kirstein, Reza Asadi, Jaeil Bai, Chao Yao, Sheng Pan, Jie‐Xiang Yu, Peter Milde, Chang Huai, Haolei Hui, Jiadong Zang, Renat Sabirianov, Xuemei M. Cheng, Guoxing Miao, Hui Xing, Yu‐Tsun Shao, Scott A. Crooker, Lukas Eng, Yanglong Hou, Jonathan P. Bird, Hao Zeng

Advanced Science· Volume 12· Issue 2

Abstract

Abstract Covalent 2D magnets such as Cr2Te3, which feature self‐intercalated magnetic cations located between monolayers of transition‐metal dichalcogenide material, offer a unique platform for controlling magnetic order and spin texture, enabling new potential applications for spintronic devices. Here, it is demonstrated that the unconventional anomalous Hall effect (AHE) in Cr2Te3, characterized by additional humps and dips near the coercive field in AHE hysteresis, originates from an intrinsic mechanism dictated by the self‐intercalation. This mechanism is distinctly different from previously proposed mechanisms such as topological Hall effect, or two‐channel AHE arising from spatial inhomogeneities. Crucially, multiple Weyl‐like nodes emerge in the electronic band structure due to strong spin‐orbit coupling, whose positions relative to the Fermi level is sensitively modulated by the canting angles of the self‐intercalated Cr cations. These nodes contribute strongly to the Berry curvature and AHE conductivity. This component competes with the contribution from bands that are less affected by the self‐intercalation, resulting in a sign change in AHE with temperature and the emergence of additional humps and dips. The findings provide compelling evidence for the intrinsic origin of the unconventional AHE in Cr2Te3 and further establish self‐intercalation as a control knob for engineering AHE in complex magnets.
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Research context

OpenAlex topics: 2D Materials and Applications · Multiferroics and related materials · Topological Materials and Phenomena

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

Affiliations

Department of Physics University at Buffalo The State University of New York Buffalo NY 14226 USA

Department of Electrical Engineering University at Buffalo The State University of New York Buffalo NY 14226 USA

School of Materials Science and Engineering Peking University Beijing 100871 China

College of Materials Science and Engineering Beijing University of Technology Beijing 100124 China

Institute of Applied Physics Technical University of Dresden 01187 Dresden Germany

Mork Family Department of Chemical Engineering and Materials Science University of Southern California Los Angeles CA 90089 USA

National High Magnetic Field Laboratory Los Alamos National Lab Los Alamos NM 87545 USA

Department of Electrical and Computer Engineering Institute for Quantum Computing University of Waterloo Ontario N2L3G1 Canada

Department of Physics University of Nebraska‐Omaha Omaha NE 68182 USA

Key Laboratory of Artificial Structures and Quantum Control Shanghai Center for Complex Physics School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China

School of Physical science and Technology Soochow University Suzhou 215006 China

Department of Physics and Astronomy University of New Hampshire Durham NH 03824 USA

Physics Department Bryn Mawr College Bryn Mawr PA 19010 USA

School of Materials Sun Yat‐Sen University Shenzhen 518107 China

Funding

National Science Foundation · National Key Research and Development Program of China · National Natural Science Foundation of China · Natural Sciences and Engineering Research Council of Canada · Basic Energy Sciences

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