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- W4301182912 abstract "The orbital Hall effect describes an electric-field-induced generation of the orbital current flowing in a perpendicular direction to the field, analogous to the spin Hall effect [1]. As the orbital current carries the angular momentum as the spin current does, injection of the orbital current into a ferromagnet can result in spin-torque on the magnetization, which provides a way to detect the orbital Hall effect [2]. With this motivation, we examine the current-induced spin-orbit torques in various ferromagnet/heavy metal bilayers [3]. Analysis of the spin-torque reveals the presence of the contribution from the orbital Hall effect in the heavy metal. In particular, we find that the net torque in Ni/Ta bilayers is opposite in sign to the spin Hall theory prediction but instead consistent with the orbital Hall theory, which unambiguously confirms the orbital torque generated by the orbital Hall effect. Our finding opens a possibility of utilizing the orbital current for spintronic device applications, and it will invigorate researches on spin-orbit-coupled phenomena based on orbital engineering. [1] Phys. Rev. B 77, 165117 (2008), Phys. Rev. Lett. 102, 016601 (2009). [2] Phys. Rev. Res. 2, 013177 (2020), arXiv: 2107.08478. [3] Nat. Comm. 12, 6710 (2021)." @default.
- W4301182912 created "2022-10-04" @default.
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- W4301182912 date "2022-10-04" @default.
- W4301182912 modified "2023-10-18" @default.
- W4301182912 title "Orbital torque in magnetic bilayers (Conference Presentation)" @default.
- W4301182912 doi "https://doi.org/10.1117/12.2635820" @default.
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