Femtosecond X-ray induced changes of the electronic and magnetic response of solids from electron redistribution

Higley, Daniel J.; Reid, Alex H.; Chen, Zhao; Guyader, Loïc Le; Hellwig, Olav; Lutman, Alberto A.; Liu, Tianmin; Shafer, Padraic; Chase, Tyler; Dakovski, Georgi L.; Mitra, Ankush; Yuan, Edwin; Schlappa, Justine; Dürr, Hermann A.; Schlotter, William F.; Stöhr, Joachim

doi:10.1038/s41467-019-13272-5

Title: Femtosecond X-ray induced changes of the electronic and magnetic response of solids from electron redistribution

Journal Article · 21 November 2019 · Nature Communications

DOI: https://doi.org/10.1038/s41467-019-13272-5 · OSTI ID:1580988

^[1];

^[2]; Chen, Zhao ^[1]; Guyader, Loïc Le ^[3]; Hellwig, Olav ^[4];

^[2]; Liu, Tianmin ^[1];

^[5]; Chase, Tyler ^[1]; Dakovski, Georgi L. ^[2]; Mitra, Ankush ^[6]; Yuan, Edwin ^[1]; Schlappa, Justine ^[7]; Dürr, Hermann A. ^[8]; Schlotter, William F. ^[2]; Stöhr, Joachim ^[2]

SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); European X-Ray Free-Electron Laser Facility GmbH, Schenefeld (Germany)
HGST a Western Digital Company, San Jose, CA (United States); Chemnitz Univ. of Technology (Germany); Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Warwick (United Kingdom)
European X-ray Free-Electron Laser (XFEL), Hamburg (Germany)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Uppsala Univ. (Sweden)

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 L₃ 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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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); VolkswagenStiftung

Grant/Contract Number:: AC02-76SF00515; AC02-05CH11231

OSTI ID:: 1580988

Alternate ID(s):: OSTI ID: 1571824

Journal Information:: Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 16 works

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Web of Science

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Electron Cascades Produced by Photoelectrons in Diamond Ziaja, Beata; Szoeke, Abraham; Hajdu, Janos arXiv https://doi.org/10.48550/arxiv.cond-mat/0208515	text	January 2002

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
Ultrafast
Femtosecond
Electronic dynamics
Magnetic dynamics
Nonlinear X-ray science
X-ray absorption spectroscopy

Title: Femtosecond X-ray induced changes of the electronic and magnetic response of solids from electron redistribution

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