Journal Article

FZJ-2026-02885

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Observation of Long-Range Current-Induced Torque in Ni/Pt Bilayers

Moriya, H. ; Taniguchi, M. ; Jo, D. ; Go, D.FZJ* ; Soya, N. ; Hayashi, H. ; Mokrousov, Y.FZJ* ; Lee, H.-W. ; Ando, K. (Corresponding author)

2024
ACS Publ. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.nanolett.3c05102

Abstract: The generation of current-induced torques through the spin Hall effect in Pt has been key to the development of spintronics. In prototypical ferromagnetic-metal/Pt devices, the characteristic length of the torque generation is known to be about 1 nm due to the short spin diffusion length of Pt. Here, we report the observation of a long-range current-induced torque in Ni/Pt bilayers. We demonstrate that when Ni is used as the ferromagnetic layer, the torque efficiency increases with the Pt thickness, even when it exceeds 10 nm. The torque efficiency is also enhanced by increasing the Ni thickness, providing evidence that the observed torque cannot be attributed to the spin Hall effect in the Pt layer. These findings, coupled with our semirealistic tight-binding calculations of the current-induced torque, suggest the possibility that the observed long-range torque is dominated by the orbital Hall effect in the Pt layer.

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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)437337265 - Spin+AFM-Dynamik: Antiferromagnetismus durch Drehimpulsströme und Gitterdynamik (A11) (437337265) (437337265)
3. DFG project G:(GEPRIS)444844585 - Statische und dynamische Kopplung von Gitter- und magnetischen Eigenschaften in zweidimensionalen Materialien mit niedriger Symmetrie (B06) (444844585) (444844585)

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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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