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Main Title: Ultrafast demagnetization dominates fluence dependence of magnetic scattering at Co M edges
Author(s): Schneider, Michael
Pfau, Bastian
Günther, Christian M.
Korff Schmising, Clemens von
Weder, David
Geilhufe, Jan
Perron, Jonathan
Capotondi, Flavio
Pedersoli, Emanuele
Manfredda, Michele
Hennecke, Martin
Vodungbo, Boris
Lüning, Jan
Eisebitt, Stefan
Type: Article
Abstract: We systematically study the fluence dependence of the resonant scattering cross-section from magnetic domains in Co/Pd-based multilayers. Samples are probed with single extreme ultraviolet (XUV) pulses of femtosecond duration tuned to the Co M3,2 absorption resonances using the FERMI@Elettra free-electron laser. We report quantitative data over 3 orders of magnitude in fluence, covering 16  mJ/cm2/pulse to 10 000  mJ/cm2/pulse with pulse lengths of 70 fs and 120 fs. A progressive quenching of the diffraction cross-section with fluence is observed. Compression of the same pulse energy into a shorter pulse—implying an increased XUV peak electric field—results in a reduced quenching of the resonant diffraction at the Co M3,2 edge. We conclude that the quenching effect observed for resonant scattering involving the short-lived Co 3p core vacancies is noncoherent in nature. This finding is in contrast to previous reports investigating resonant scattering involving the longer-lived Co 2p states, where stimulated emission has been found to be important. A phenomenological model based on XUV-induced ultrafast demagnetization is able to reproduce our entire set of experimental data and is found to be consistent with independent magneto-optical measurements of the demagnetization dynamics on the same samples.
Subject(s): demagnetization
magnetic multilayers
free-electron lasers
Issue Date: 15-Sep-2020
Date Available: 26-Oct-2020
Language Code: en
DDC Class: 530 Physik
Journal Title: Physical review B
Publisher: American Physical Society
Volume: 125
Issue: 12
Article Number: 127201
Publisher DOI: 10.1103/PhysRevLett.125.127201
EISSN: 1079-7114
ISSN: 0031-9007
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Inst. Optik und Atomare Physik
Appears in Collections:Technische Universität Berlin » Publications

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