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Observation of Long-Range Current-Induced Torque in Ni/Pt Bilayers.
Moriya, Hiroyuki; Taniguchi, Mari; Jo, Daegeun; Go, Dongwook; Soya, Nozomi; Hayashi, Hiroki; Mokrousov, Yuriy; Lee, Hyun-Woo; Ando, Kazuya.
Afiliação
  • Moriya H; Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan.
  • Taniguchi M; Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan.
  • Jo D; Department of Physics, Pohang University of Science and Technology, Pohang 37673, Korea.
  • Go D; Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
  • Soya N; Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany.
  • Hayashi H; Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan.
  • Mokrousov Y; Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan.
  • Lee HW; Keio Institute of Pure and Applied Sciences, Keio University, Yokohama 223-8522, Japan.
  • Ando K; Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
Nano Lett ; 24(22): 6459-6464, 2024 Jun 05.
Article em En | MEDLINE | ID: mdl-38780051
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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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nano Lett Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Japão

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nano Lett Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Japão