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Anatomy of spin-orbit-torque-assisted magnetization dynamics in Co/Pt bilayers: Importance of the orbital torque
Univ Konstanz, Dept Phys, D-78457 Constance, Germany..
Budapest Univ Technol & Econ, Inst Phys, Dept Theoret Phys, Muegyetem Rakpart 3, H-1111 Budapest, Hungary..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Budapest Univ Technol & Econ, Inst Phys, Dept Theoret Phys, Muegyetem Rakpart 3, H-1111 Budapest, Hungary..ORCID iD: 0000-0003-1931-6075
HUN REN Wigner Res Ctr Phys, Dept Theoret Solid State Phys, H-1525 Budapest, Hungary..
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2025 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 112, no 14, article id 144438Article in journal (Refereed) Published
Abstract [en]

Understanding the mechanism driving magnetization switching in spin-orbit-torque-assisted devices remains a subject of debate. While originally attributed to the spin Hall effect and spin Rashba-Edelstein effect, recent discoveries related to orbital moments induced by the orbital Hall effect and the orbital Rashba-Edelstein effect have added complexity to the comprehension of the switching process in nonmagnet/ferromagnet bilayers. Addressing this challenge, we present a quantitative investigation of a Pt/Co bilayer by employing atomistic spin dynamics simulations, incorporating the proximity-induced moments of Pt, as well as electrically induced spin and orbital moments obtained from first-principles calculations. Our layer-resolved model elucidates the dampinglike and fieldlike nature of the induced moments by separating them according to their even and odd magnetization dependence. In addition to demonstrating that a larger fieldlike spin-orbit-torque contribution comes from previously disregarded induced orbital moments, our work highlights the necessity of considering interactions with Pt-induced moments at the interface, as they contribute significantly to the switching dynamics.

Place, publisher, year, edition, pages
American Physical Society, 2025. Vol. 112, no 14, article id 144438
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Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-575537DOI: 10.1103/5k5n-4hr7ISI: 001637915700005Scopus ID: 2-s2.0-105020852509OAI: oai:DiVA.org:uu-575537DiVA, id: diva2:2027819
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Swedish Research CouncilSwedish Research Council, 2022-06725Available from: 2026-01-13 Created: 2026-01-13 Last updated: 2026-01-13Bibliographically approved

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Salemi, LeandroOppeneer, Peter M.

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