Journal Article

PUBDB-2025-05675

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Anomalous Magnetization Dynamics After Dual Optical Excitation

Parchenko, S. (Corresponding author)XFEL.EU*DESY* ; Oppeneer, P. M.Extern*XFEL.EU* ; Scherz, A.XFEL.EU*

2026
Wiley-VCH GmbH Weinheim

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Please use a persistent id in citations: doi:10.1002/apxr.202500057  doi:10.3204/PUBDB-2025-05675

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

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Contributing Institute(s):

1. SCS (XFEL_E2_SCS)

Research Program(s):

1. 6G13 - Accelerator of European XFEL (POF4-6G13) (POF4-6G13)
2. DFG project G:(GEPRIS)328545488 - TRR 227: Ultraschnelle Spindynamik (328545488) (328545488)

Experiment(s):

1. Experiments at XFEL

Appears in the scientific report 2026

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Database coverage:
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