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Anisotropic magnetoresistance and planar Hall effect in an antiferromagnetic insulator-topological insulator heterostructure

Yuxin Liu1,2, Yongqing Li1,2, and Jing Teng1,2,3,*

  • *Contact author: jteng@iphy.ac.cn
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Phys. Rev. Research 7, 033182 – Published 21 August, 2025

DOI: https://doi.org/10.1103/32h4-l2j6

Abstract

The coupling between magnetism and topological states at a topological insulator (TI)-magnetic insulator interface can induce exchange gap opening and spin texture change, resulting in many emergent transport phenomena, including anisotropic magnetoresistance (AMR) and planar Hall effect (PHE). While AMR/PHE have been reported in several ferromagnetic insulator-TI heterostructures so far, such effects in antiferromagnetic insulator-TI heterostructure remain elusive. Here, we observe unique features of AMR and PHE in an antiferromagnetic insulator-TI heterostructure MnSe/(Bi,Sb)2Te3. Specifically, at low magnetic fields (H), the in-plane AMR exhibits dips under H applied parallel to the current (H//I) but peaks under the perpendicular geometry (H⊥I), opposite to the zero AMR features in ferromagnetic insulator-TI heterostructures. The low-field PHE is most striking at H//I, but gradually suppressed when H deviates from parallel direction. At high magnetic fields, both AMR and PHE show prominent π-period oscillation. Gate-tuning and temperature-dependence measurements demonstrate that the observed AMR/PHE originate from the interplay between the topological surface state of TI with the spin canting and magnetic phase transition of MnSe. These results not only differentiate the AMR/PHE in TI-based magnetic heterostructure from the pristine TI, but also offer a feasible way to distinguish spin Hall effect and AMR in TI-based heterostructures.

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Phys. Rev. Research 7, 033182– Published 21 August, 2025
  • Received 19 March 2025
  • Accepted 25 July 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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