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Demagnetization dynamics after noncollinear dual optical excitation
European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany..
Univ Strasbourg, Inst Phys & Chim Mat Strasbourg, CNRS, UMR 7504, F-67000 Strasbourg, France.;Sorbonne Univ, CNRS, Lab Chim Phys Matiere & Rayonnement, F-75005 Paris, France..
DESY, Notkestr 85, D-22607 Hamburg, Germany.;Christian Albrechts Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.ORCID iD: 0000-0001-9555-0619
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2024 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 110, no 5, article id 054425Article in journal (Refereed) Published
Abstract [en]

We explore the impact of optical excitation using two interfering ultrashort optical pulses on ultrafast magnetization dynamics. Our investigation focuses on Pt/Co/Pt multilayers and TbCo alloy samples, employing a dual pump approach. We observe significant variations in the dynamics of magnetization suppression and subsequent recovery when triggered with two optical pulses of the same polarization-essentially meeting conditions for interference. Conversely, dynamics triggered with cross-polarized pump beams exhibit expected similarity to that triggered with a single pulse. Delving into the underlying physical processes contributing to laser-induced demagnetization and recovery dynamics, we find that our current understanding cannot elucidate the observed trends. Consequently, we propose that optical excitation with interfering light possesses the capacity to induce long-lasting alterations in the dynamics of angular momentum.

Place, publisher, year, edition, pages
American Physical Society, 2024. Vol. 110, no 5, article id 054425
National Category
Atom and Molecular Physics and Optics Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-537869DOI: 10.1103/PhysRevB.110.054425ISI: 001294114900003OAI: oai:DiVA.org:uu-537869DiVA, id: diva2:1897228
Funder
Swedish Research Council, 2019-03581Knut and Alice Wallenberg Foundation, 2022.0079Knut and Alice Wallenberg Foundation, 2023.0336Swedish Research Council, 2019-03581Available from: 2024-09-12 Created: 2024-09-12 Last updated: 2024-09-12Bibliographically approved

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Åberg Larsson, AgneKapaklis, VassiliosOppeneer, Peter M.

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