Anatomy of spin-orbit-torque-assisted magnetization dynamics in Co/Pt bilayers: Importance of the orbital torqueShow others and affiliations
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
National Category
Condensed Matter Physics
Identifiers
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
Funder
Swedish Research CouncilSwedish Research Council, 2022-067252026-01-132026-01-132026-01-13Bibliographically approved