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001     624388
005     20250310221550.0
024 7 _ |a 10.3204/PUBDB-2025-00857
|2 datacite_doi
024 7 _ |a arXiv:2502.03301
|2 arXiv
037 _ _ |a PUBDB-2025-00857
041 _ _ |a English
088 _ _ |a arXiv:2502.03301
|2 arXiv
100 1 _ |a Marotzke, S.
|0 P:(DE-H253)PIP1032134
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245 _ _ |a First experiments with ultrashort, circularly polarized soft X-ray pulses at FLASH2
260 _ _ |c 2025
336 7 _ |a Preprint
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336 7 _ |a Electronic Article
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336 7 _ |a ARTICLE
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520 _ _ |a Time-resolved absorption spectroscopy as well as magnetic circular dichroism with circularly polarized soft X-rays (XAS and XMCD) are powerful tools to probe electronic and magnetic dynamics in magnetic materials element- and site-selectively. Employing these methods, groundbreaking results have been obtained for instance for magnetic alloys, which helped to fundamentally advance the field of ultrafast magnetization dynamics. At the free electron laser facility FLASH key capabilities for ultrafast XAS and XMCD experiments have recently improved: In an upgrade, an APPLE-III helical afterburner undulator was installed at FLASH2 in September 2023. This installation allows for the generation of circularly polarized soft X-ray pulses with a duration of a few tens of femtoseconds covering the L3,2-edges of the important 3d transition metal elements with pulse energies of several uJ. Here, we present first experimental results with such ultrashort X-ray pulses from the FL23 beamline employing XMCD at the L-edges of the 3d metals, Co, Fe and Ni. We obtain significant dichroic difference signals indicating a degree of circular polarization close to 100%. With the pulse-length preserving monochromator at beamline FL23 and an improved pump laser setup, FLASH can offer important and efficient experimental instrumentation for studies on ultrafast spin dynamics in 3d transition metals, multilayers, and alloys.
536 _ _ |a 631 - Matter – Dynamics, Mechanisms and Control (POF4-631)
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536 _ _ |a 6G2 - FLASH (DESY) (POF4-6G2)
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536 _ _ |a DFG project G:(GEPRIS)328545488 - TRR 227: Ultraschnelle Spindynamik (328545488)
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536 _ _ |a 05K22KE2 - Messplatz für ultraschnelle Spindynamik bei FLASH (BMBF-05K22KE2)
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588 _ _ |a Dataset connected to DataCite
650 _ 7 |a Materials Science (cond-mat.mtrl-sci)
|2 Other
650 _ 7 |a FOS: Physical sciences
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693 _ _ |a FLASH2
|f FLASH2 Beamline FL23
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700 1 _ |a Gupta, D.
|b 1
700 1 _ |a Wang, R. -P.
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700 1 _ |a Pavelka, M.
|b 3
700 1 _ |a Dziarzhytski, S.
|b 4
700 1 _ |a Schmising, C. von Korff
|b 5
700 1 _ |a Jana, S.
|b 6
700 1 _ |a Thielemann-Kühn, N.
|b 7
700 1 _ |a Amrhein, T.
|b 8
700 1 _ |a Weinelt, M.
|b 9
700 1 _ |a Vaskivskyi, I.
|b 10
700 1 _ |a Knut, R.
|b 11
700 1 _ |a Engel, D.
|b 12
700 1 _ |a Braune, M.
|b 13
700 1 _ |a Ilchen, M.
|b 14
700 1 _ |a Savio, S.
|b 15
700 1 _ |a Otto, T.
|b 16
700 1 _ |a Tiedtke, K.
|b 17
700 1 _ |a Scheppe, V.
|b 18
700 1 _ |a Rönsch-Schulenberg, J.
|b 19
700 1 _ |a Schneidmiller, E.
|b 20
700 1 _ |a Schüßler-Langeheine, C.
|b 21
700 1 _ |a Dürr, H. A.
|b 22
700 1 _ |a Beye, M.
|b 23
700 1 _ |a Brenner, G.
|b 24
700 1 _ |a Pontius, N.
|0 P:(DE-H253)PIP1008858
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|e Corresponding author
856 4 _ |y OpenAccess
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910 1 _ |a Deutsches Elektronen-Synchrotron
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