Journal Article

FZJ-2026-03927

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fluctuation-Mediated Spin–Orbit Torque Enhancement in the Noncollinear Antiferromagnet Mn 3 Ni 0.35 Cu 0.65 N

Bose, A. (Corresponding author) ; Saunderson, T.FZJ* ; Shahee, A. ; Zhang, L. ; Hajiri, T. ; Rajan, A. ; Kumar, D. ; Go, D.FZJ* ; Asano, H. ; Schwingenschlögl, U. ; Manchon, A. ; Mokrousov, Y.FZJ* ; Kläui, M.

2025
ACS Publ. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.nanolett.4c05423  doi:10.34734/FZJ-2026-03927

Abstract: We report strong spin−orbit torques (SOTs) generated bynoncollinear antiferromagnets Mn3Ni0.35Cu0.65N, over a wide temperature range.The SOT efficiency peaks up to 0.3 at the Né el temperature (TN), substantiallyhigher than that of commonly studied nonmagnets, such as Pt. The sign andmagnitude of the SOTs measured in our experiments are corroborated bydensity functional theory, confirming the dominance of the orbital Hall effectover the spin Hall effect in the nonmagnetic phase above TN. In contrast, thestrong temperature-dependent SOTs observed around and below TN can beexplained by recently developed mechanisms involving chirality-induced andextrinsic scattering-driven spin and orbital currents, considering the effect of spinfluctuations at finite temperatures. Our work not only reports a large magnitude of SOT but also sheds light on a new possible originwhere orbital currents can be harnessed by leveraging the chirality of noncollinear antiferromagnets, which holds promise formagnetic memory applications.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (PGI-1)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)
2. DFG project G:(GEPRIS)290319996 - Spin+Bahn-Wechselwirkung: Orbitronik und Spin-Bahn Effekte (A01) (290319996) (290319996)
3. DFG project G:(GEPRIS)437337265 - Spin+AFM-Dynamik: Antiferromagnetismus durch Drehimpulsströme und Gitterdynamik (A11) (437337265) (437337265)
4. DFG project G:(GEPRIS)532928663 - Spin+Sensing: Nanoskalige Spin-Phänomene untersucht mit NV-Magnetometrie (A12*) (532928663) (532928663)
5. DFG project G:(GEPRIS)290396061 - Spin+Strom: Drehimpulstransport durch Magnonen, Spins und Orbits (B02) (290396061) (290396061)
6. DFG project G:(GEPRIS)358671374 - Magnetische Austauschkopplung und elektrisches Schalten in multiferroischen BiFeO3/Doppelperowskit Heterostrukturen (358671374) (358671374)
7. s-NEBULA - Novel Spin-Based Building Blocks for Advanced TeraHertz Applications (863155) (863155)
8. 3D MAGiC - Three-dimensional magnetization textures: Discovery and control on the nanoscale (856538) (856538)
9. MagnEFi - Magnetism and the effects of Electric Field (860060) (860060)

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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