Journal Article

FZJ-2024-00558

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Detection of long-range orbital-Hall torques

Bose, A. (Corresponding author) ; Kammerbauer, F. ; Gupta, R. ; Go, D.FZJ* ; Mokrousov, Y.FZJ* ; Jakob, G. ; Kläui, M.

2023
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevB.107.134423  doi:10.34734/FZJ-2024-00558

Abstract: We report and quantify a large orbital-Hall torque generated by Nb and Ru, which we identify from the strong dependence of torques on the ferromagnets. This is manifested as strong enhancement in the dampinglike torques measured in Nb (or Ru)/Ni bilayers as compared to Nb (or Ru)/FeCoB bilayers including the sign reversal in the case of Nb/(Ni or FeCoB) samples. We experimentally observe a striking enhancement of the measured torques with the increase of ferromagnetic Ni thickness which is markedly different from the regular spin-transfer torque; this could be a unique signature of long-range action of the orbital-Hall torques.

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Contributing Institute(s):

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

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)
2. DFG project 437337265 - Spin+AFM-Dynamik: Antiferromagnetismus durch Drehimpulsströme und Gitterdynamik (A11) (437337265) (437337265)
3. DFG project 290396061 - Spin+Strom: Drehimpulstransport durch Magnonen, Spins und Orbits (B02) (290396061) (290396061)
4. DFG project 290319996 - Spin+Bahn-Wechselwirkung: Orbitronik und Spin-Bahn Effekte (A01) (290319996) (290319996)
5. DFG project 358671374 - Magnetische Austauschkopplung und elektrisches Schalten in multiferroischen BiFeO3/Doppelperowskit Heterostrukturen (358671374) (358671374)
6. 3D MAGiC - Three-dimensional magnetization textures: Discovery and control on the nanoscale (856538) (856538)

Appears in the scientific report 2023

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