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  • Letter
  • Open Access

Topological spin-orbit torque in ferrimagnetic Weyl semimetal

Tomonari Meguro1,*, Akihiro Ozawa2,†, Koji Kobayashi3,‡, Yasufumi Araki4,§, and Kentaro Nomura1,∥

  • 1Department of Physics, Kyushu University, Fukuoka 819-0395, Japan
  • 2Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
  • 3Physics Division, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan
  • 4Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

  • *Contact author: meguro.tomonari@mbp.phys.kyushu-u.ac.jp
  • †Contact author: akihiroozawa@issp.u-tokyo.ac.jp
  • ‡Contact author: k-koji@sophia.ac.jp
  • §Contact author: araki.yasufumi@jaea.go.jp
  • ∥Contact author: nomura.kentaro@mbp.phys.kyushu-u.ac.jp
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Phys. Rev. Research 7, L022065 – Published 12 June, 2025

DOI: https://doi.org/10.1103/PhysRevResearch.7.L022065

Abstract

We theoretically find a topological spin-orbit torque (SOT) in the compensated ferrimagnetic Weyl semimetal Ti2MnAl. The topological SOT arises from all the occupied states, which is free from dissipation. However, it is negligible in metallic magnets and was not reported in Weyl semimetals. We show the enhancement of the topological SOT from the mixed Berry curvature around the Weyl points in Ti2MnAl. This finding provides a guiding principle for designing highly efficient SOT devices using the topological nature of ferrimagnetic Weyl semimetals.

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Outline

Information

Phys. Rev. Research 7, L022065– Published 12 June, 2025
  • Received 29 September 2024
  • Revised 11 March 2025
  • Accepted 23 April 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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