Presentation Information

5:30 PM - 5:45 PM JST(8:30 AM - 8:45 AM UTC)English Presentation

[8p-N303-16]Unconventional spin Hall magnetoresistance in a non-collinear antiferromagnet/heavy metal heterostructure

〇Tomohiro Uchimura^1,2, Jiahao Han^1,3, Ping Tang³, Ju-Young Yoon¹, Yutaro Takeuchi³, Yuta Yamane^1,4, Shun Kanai^{1,2,3,5,6,7,8}, Gerrit E. W. Bauer^3,7,9,10, Hideo Ohno^1,2,3,7,11, Shunsuke Fukami^{1,2,3,7,11,12} (1.RIEC, Tohoku Univ., 2.Graduate School of Engineering, Tohoku Univ., 3.WPI-AIMR, Tohoku Univ., 4.FRIS, Tohoku Univ., 5.PRESTO, JST, 6.DEFS, Tohoku Univ., 7.CSIS, Tohoku Univ., 8.QST, 9.IMR, Tohoku Univ., 10.Kavli ITS, UCAS, 11.CIES, Tohoku Univ., 12.InaRIS)

Keywords:

Spintronics,Spin Hall magnetoresistance,Non-collinear antiferromagnet

We study the spin Hall magnetoresistance (SMR) in non-collinear 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 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 conductionelectron 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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