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Spin-Hall angle temperature dependence in NiFe/MnBi2Te4 heterostructures

A. S. Pakhomov1,2,*, V. V. Yurlov1,2, P. N. Skirdkov1,3, M. V. Bakhmetiev2, R. B. Morgunov2, N. T. Hai4, J. C. Wu4, J. C. A. Huang5, S. H. Su5 et al.

C. F. Almeida Alves6, E. Paz6, A. I. Chernov2, and K. A. Zvezdin1

  • *Contact author: alexanderpakhomov.17@gmail.com
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Phys. Rev. B 114, 074433 – Published 26 August, 2026

DOI: https://doi.org/10.1103/8ndt-kt7c

Abstract

We investigate magnetization dynamics and spin-charge conversion in NiFe/MnBi2Te4 heterostructures using broadband, temperature-resolved ferromagnetic resonance spectroscopy and inverse spin-Hall effect (ISHE) measurements over the 20–290 K range. A Landau-Lifshitz-Gilbert-based model simultaneously fits the temperature-dependent effective Gilbert damping αeff and the ISHE voltage, yielding the spin-Hall angle θISHE. We find that θISHE remains nearly constant (≈0.12–0.3) at approximately 120–130 K. Above this temperature, αeff and VISHE decouple: the voltage drops while the damping increases, indicating that parasitic spin-rectification and a slight temperature drift of intrinsic NiFe damping dominate the signal and obscure direct spin-charge conversion. These results establish MnBi2Te4 as a robust platform for low-temperature spintronics and define the thermal boundaries above which secondary voltage contributions must be carefully managed.

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Phys. Rev. B 114, 074433– Published 26 August, 2026
  • Received 28 July 2025
  • Accepted 4 August 2026
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