Record Details

Title:
Femtosecond X-ray induced changes of the electronic and magnetic response of solids from electron redistribution
Affiliation(s):
EuXFEL staff, Other
Author group:
Instrument SCS
Topic:
Scientific area:
Abstract:
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.
Imprint:
2019
Journal Information:
Nature Communications, 10 (1), 5289 (2019)
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Language(s):
English
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