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Femtosecond X-ray induced changes of the electronic and magnetic response of solids from electron redistribution
SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA;Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA.
SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.
SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA;Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA;European Xray Free Electron Laser Facil GmbH, Holzkoppel 4, D-22869 Schenefeld, Germany.
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2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 5289Article in journal (Refereed) Published
Abstract [en]

Resonant X-ray absorption, where an X-ray photon excites a core electron into an unoccupied valence state, is an essential process in many standard X-ray spectroscopies. With increasing X-ray intensity, the X-ray absorption strength is expected to become nonlinear. Here, we report the onset of such a nonlinearity in the resonant X-ray absorption of magnetic Co/Pd multilayers near the Co L-3 edge. The nonlinearity is directly observed through the change of the absorption spectrum, which is modified in less than 40 fs within 2 eV of its threshold. This is interpreted as a redistribution of valence electrons near the Fermi level. For our magnetic sample this also involves mixing of majority and minority spins, due to sample demagnetization. Our findings reveal that nonlinear X-ray responses of materials may already occur at relatively low intensities, where the macroscopic sample is not destroyed, providing insight into ultrafast charge and spin dynamics.

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Nature Publishing Group, 2019. Vol. 10, article id 5289
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Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-398585DOI: 10.1038/s41467-019-13272-5ISI: 000497699100022PubMedID: 31754109OAI: oai:DiVA.org:uu-398585DiVA, id: diva2:1376198
Available from: 2019-12-09 Created: 2019-12-09 Last updated: 2019-12-09Bibliographically approved

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