Devda, Harshita and Deák, András and Salemi, Leandro and Rózsa, Levente and Szunyogh, László and Oppeneer, Peter M. and Nowak, Ulrich (2025) Anatomy of spin-orbit-torque-assisted magnetization dynamics in Co/Pt bilayers: Importance of the orbital torque. PHYSICAL REVIEW B, 112 (14). No. 144438. ISSN 2469-9950
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Abstract
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. © 2025 American Physical Society
| Item Type: | Article |
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| Additional Information: | This work has been supported by the the German Research Foundation [Deutsche Forschungsgemeinschaft) through CRC/TRR 227 (Project MF, Project-ID: 328545488)] and Collaborative Research Center SFB 1432 project ID 425217212, the Swedish Research Council (VR), the K. and A. Wallenberg Foundation (Grants No. 2022.0079 and No. 2023.0336), by the EIC Pathfinder OPEN Grant No. 101129641 “OBELIX,” by the National Research, Development, and Innovation Office (NRDI) of Hungary under Projects No. K131938, No. K142652, No. FK142601, and ADVANCED 149745, by the Thematic Area Excellence Program of the Ministry of Culture and Innovation from the NRDI Fund through the Grant No. TKP2021-NVA-02, and by the Hungarian Academy of Sciences via a János Bolyai Research Grant (Grant No. BO/00178/23/11). Computational resources were provided by the core facility SCCKN in Konstanz and the National Academic Infrastructure for Supercomputing in Sweden (NAISS) at NSC Linköping, partially funded by VR through Grant Agreement No. 2022-06725. |
| Uncontrolled Keywords: | DYNAMICS; MAGNETIZATION; platinum; ORBITALS; Torque; Ferromagnets; spin dynamics; Spin orbits; Bi-layer; Magnetization switching; Switching process; spin orbit coupling; spin Hall effect; Magnetization dynamics; Quantitative investigation; Atomistics; Orbital moment; |
| Subjects: | Q Science / természettudomány > QC Physics / fizika |
| SWORD Depositor: | MTMT SWORD |
| Depositing User: | MTMT SWORD |
| Date Deposited: | 14 Sep 2026 08:19 |
| Last Modified: | 14 Sep 2026 08:19 |
| URI: | https://real.mtak.hu/id/eprint/246213 |
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