TY  - JOUR
AU  - Marotzke, Simon
AU  - Gupta, Deeksha
AU  - Wang, Ru-Pan
AU  - Pavelka, Martin
AU  - Dziarzhytski, Siarhei
AU  - von Korff Schmising, Clemens
AU  - Jana, Somnath
AU  - Thielemann-Kuehn, Nele
AU  - Amrhein, Tim
AU  - Weinelt, Martin
AU  - Vaskivskyi, Igor
AU  - Knut, Ronny
AU  - Engel, Dieter
AU  - Braune, Markus
AU  - Ilchen, Markus
AU  - Savio, Sara
AU  - Otto, Thorsten
AU  - Tiedtke, Kai
AU  - Scheppe, V.
AU  - Rönsch-Schulenberg, Juliane
AU  - Schneidmiller, Evgeny Alexanrdovich
AU  - Schuessler-Langeheine, Christian
AU  - Duerr, Hermann
AU  - Beye, Martin
AU  - Brenner, Guenter
AU  - Pontius, Niko
TI  - First experiments with ultrashort, circularly polarized soft x-ray pulses at FLASH2
JO  - Structural dynamics
VL  - 12
IS  - 3
SN  - 2329-7778
CY  - Melville, NY
PB  - AIP Publishing LLC
M1  - PUBDB-2025-00512
SP  - 034301
PY  - 2025
N1  - Additional grant:Deutsche Forschungsgemeinschaft (DFG) - ProjectID 328545488 - TRR 227 “Ultrafast Spin Dynamics”.
AB  - Time-resolved absorption Spectroscopy as well as Magnetic Circular Dichroism with circularpolarized soft X-rays (XAS and XMCD) are powerful tools to probe electronic and magnetic dynamicsin magnetic materials in an element- and site selective manner. Employing these methods,groundbreaking results have been achieved for instance for magnetic alloys, which helped to fundamentallyadvance the field. The possibilities for ultrafast XAS and XMCD experiments, haverecently improved: In an upgrade of the free electron laser FLASH, a variable polarization afterburnerundulator at FLASH2 was installed in September 2023. This upgrade allows the generationof few tens of femtosecond short circularly polarized soft X-ray pulses covering the L2,3-edges of theimportant 3d transition metal elements. Here, we present first experimental results with circularlypolarized ultrashort X-ray pulses from the FL23 beamline employing XMCD at the L-edges of the3d elements, Co, Fe and Ni. We obtain significant XMCD, which hints to a degree of circular polarizationclose to 100
LB  - PUB:(DE-HGF)16
C6  - 40352094
UR  - <Go to ISI:>//WOS:001488980600001
DO  - DOI:10.1063/4.0000298
UR  - https://bib-pubdb1.desy.de/record/622831
ER  -