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We study the spin Hall magnetoresistance (SMR) in noncollinear antiferromagnet Mn3Sn/heavy-metal stacks. The measured SMR exhibits peculiar magnetic field angle and magnitude dependence that sharply deviates from the conventional SMR theory based on the damping-like spin-transfer torque. An alternative model based on a coherent field-like torque reproduces the observations well. Our work reveals a previously unrecognized mechanism of interfacial exchange that indicates a precession of the conduction electron spins in the collective local exchange fields of the noncollinear antiferromagnetic order.
The unraveled physics is essential to understanding and controlling spin transport in unconventional
magnetic materials.

Rights:

• In Copyright
  

  ©2025 American Physical Society

Keyword: spintronics, antiferromagnet, spin Hall magnetoresistance

Date published: 2025-03-03

Publisher: American Physical Society (APS)

Journal:

• Physical Review Letters (ISSN: 10797114) vol. 134 issue. 9 096701

Funding:

• Japan Society for the Promotion of Science 19H05622
• Japan Society for the Promotion of Science 21J23061
• Japan Society for the Promotion of Science 22KF0035
• Japan Society for the Promotion of Science 22K14558
• Japan Society for the Promotion of Science 23KJ0216
• Japan Society for the Promotion of Science 24H00039
• Japan Society for the Promotion of Science 24H02235
• Japan Society for the Promotion of Science 24K16999
• Japan Science and Technology Agency JPMJAP2322
• Casio Science Promotion Foundation 40-4
• Research Institute of Electrical Communication, Tohoku University
• Tohoku University
• JST TI-FRIS
• AIMR Fusion Research Projects

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5418

First published URL: https://doi.org/10.1103/physrevlett.134.096701

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Updated at: 2025-04-12 08:30:22 +0900

Published on MDR: 2025-04-11 20:23:06 +0900