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@ARTICLE{Marotzke:622831,
      author       = {Marotzke, Simon and Gupta, Deeksha and Wang, Ru-Pan and
                      Pavelka, Martin and Dziarzhytski, Siarhei and von Korff
                      Schmising, Clemens and Jana, Somnath and Thielemann-Kuehn,
                      Nele and Amrhein, Tim and Weinelt, Martin and Vaskivskyi,
                      Igor and Knut, Ronny and Engel, Dieter and Braune, Markus
                      and Ilchen, Markus and Savio, Sara and Otto, Thorsten and
                      Tiedtke, Kai and Scheppe, V. and Rönsch-Schulenberg,
                      Juliane and Schneidmiller, Evgeny Alexanrdovich and
                      Schuessler-Langeheine, Christian and Duerr, Hermann and
                      Beye, Martin and Brenner, Guenter and Pontius, Niko},
      title        = {{F}irst experiments with ultrashort, circularly polarized
                      soft x-ray pulses at {FLASH}2},
      journal      = {Structural dynamics},
      volume       = {12},
      number       = {3},
      issn         = {2329-7778},
      address      = {Melville, NY},
      publisher    = {AIP Publishing LLC},
      reportid     = {PUBDB-2025-00512},
      pages        = {034301},
      year         = {2025},
      note         = {Additional grant:Deutsche Forschungsgemeinschaft (DFG) -
                      ProjectID 328545488 - TRR 227 “Ultrafast Spin
                      Dynamics”.},
      abstract     = {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 $100\%.$
                      Making use of the full pulse-length preserving monochromator
                      capabilitiesof FL23 and an improved pump laser setup, FLASH
                      offers important and efficient experimentalinfrastructure
                      for ultrafast spin dynamics studies in 3d transition
                      metals.},
      cin          = {DOOR ; HAS-User / FS-FLASH / FS-FLASH-B / FS-FLASH-O /
                      CFEL-XAC},
      ddc          = {500},
      cid          = {I:(DE-H253)HAS-User-20120731 / I:(DE-H253)FS-FLASH-20140814
                      / I:(DE-H253)FS-FLASH-B-20160930 /
                      I:(DE-H253)FS-FLASH-O-20160930 /
                      I:(DE-H253)CFEL-XAC-20240710},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G2 - FLASH (DESY) (POF4-6G2) / FS-Proposal:
                      F-20211728 EC (F-20211728-EC) / FS-Proposal: F-20220710
                      (F-20220710) / DFG project G:(GEPRIS)328545488 - TRR 227:
                      Ultraschnelle Spindynamik (328545488)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G2 /
                      G:(DE-H253)F-20211728-EC / G:(DE-H253)F-20220710 /
                      G:(GEPRIS)328545488},
      experiment   = {EXP:(DE-H253)F-PL23-20230101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {40352094},
      UT           = {WOS:001488980600001},
      doi          = {10.1063/4.0000298},
      url          = {https://bib-pubdb1.desy.de/record/622831},
}