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Anomalous Magnetization Dynamics After Dual Optical Excitation
European XFEL, Schenefeld, Germany..ORCID iD: 0000-0002-4320-4957
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0002-9069-2631
European XFEL, Schenefeld, Germany..
2026 (English)In: Advanced Physics Research, ISSN 2751-1200, Vol. 5, no 2, article id e00057Article in journal (Refereed) Published
Abstract [en]

Ultrafast optical excitation is widely used to manipulate electronic and magnetic properties of materials on femtosecond timescales. In this study, we investigate the response of copper to circularly polarized femtosecond pulses using time-resolved magneto-optical Kerr effect measurements. We compare the dynamics induced by single-pulse excitation with those resulting from a dual-pump configuration, in which two pulses arrive simultaneously from different directions. Although the individual contributions of the two pumps are similar when applied separately, their combined effect leads to a marked change in the spin/orbital dynamics. Specifically, we observe an approximately 2.5-fold increase in the decay time of the spin/orbital imbalance signal under dual-pump excitation. This result indicates that the joint action of two optical pulses can qualitatively alter the relaxation pathways in the system, beyond a simple additive response. The observed behavior highlights a previously unexplored regime of light-induced dynamics and suggests new strategies for controlling ultrafast processes in solids.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2026. Vol. 5, no 2, article id e00057
Keywords [en]
dual optical excitation, inverse Faraday effect, ultrafast spin dynamics
National Category
Atom and Molecular Physics and Optics Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-582696DOI: 10.1002/apxr.202500057ISI: 001633940000001OAI: oai:DiVA.org:uu-582696DiVA, id: diva2:2047417
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, 2022.0079Knut and Alice Wallenberg Foundation, 2023.0336Available from: 2026-03-20 Created: 2026-03-20 Last updated: 2026-03-20Bibliographically approved

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Oppeneer, Peter M.

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