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Updated: May 20, 2025

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
Unconventional Spin Hall Magnetoresistance in Noncollinear Antiferromagnet/Heavy-Metal Stacks
Tomohiro Uchimura1,2, Jiahao Han1,3, Ping Tang3
1Tohoku University, Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Sendai, Japan.
Abstract:
We study the spin Hall magnetoresistance (SMR) in noncollinear antiferromagnet Mn_{3}Sn/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 dampinglike spin-transfer torque. An alternative model based on a coherent fieldlike 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.
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