journal article·2026-02

Room‐Temperature Magnetic Order in Topological Insulator Coupled with Highly Resistive Ferromagnet

Ning Jiang, Huiying Liu, Cong Wang, Guixin He, Naizhou Wang, Zhaowei Zhang, Rui‐Chun Xiao, Weibo Gao, Shifeng Zhao

Advanced Functional Materials· Volume 36· Issue 14
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Abstract

Abstract Inducing long‐range magnetic order in topological insulators (TIs), thereby breaking the time‐reversal symmetry, is essential for constructing exotic new phases such as the quantum anomalous Hall effect or the axion insulator state. The magnetic proximity effect is regarded as a promising strategy to induce uniform magnetization to the topological surface states from ferromagnetic insulators. However, existing ferromagnetic insulators are difficult to introduce robust magnetic order into TIs at room temperature. This work designs a novel highly resistive ferromagnet by assembling Ni 80 Fe 20 clusters, and magnetic order is introduced into Bi 2 Te 3 via the magnetic proximity effect. The Ni 80 Fe 20 /Bi 2 Te 3 heterojunction exhibits a large anomalous Hall effect (AHE) at room temperature and can be effectively controlled by the cluster size. This indicates that the strong magnetic order has been induced into TIs, and the strength of proximity coupling is easily controllable. Theoretical analysis demonstrates that the proximity‐induced magnetism at the point contact interface cooperating with the strong spin‐orbit coupling in the TI effectively enhances the skew scattering mechanism, thereby dominating the AHE over the entire temperature range. The work provides a promising strategy for achieving room‐temperature magnetic order in TIs, and reveals its potential in manipulating topological surface states.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Advanced Condensed Matter Physics · Magnetic properties of thin films

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

Affiliations

Inner Mongolia Key Laboratory of Microscale Physics and Atomic manufacturing School of Physical Science and Technology Inner Mongolia University Hohhot 010021 China

School of Physics and Electronic Information Inner Mongolia Normal University Hohhot 010022 China

School of Physics Beihang University Beijing 100191 China

College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 China

Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore

Department of Physics School of Sciences Great Bay University Dongguan 523000 China

Great Bay Institute for Advanced Study Dongguan 523000 China

Institute of Physical Science and Information Technology Anhui University Hefei 230601 China

Center for Quantum Physics and Technologies Inner Mongolia University Hohhot 010021 China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Inner Mongolia Autonomous Region · Fundamental Research Funds for the Central Universities · National Research Foundation Singapore · Research Program of Science and Technology at Universities of Inner Mongolia Autonomous Region

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