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@ARTICLE{Fognini:169880,
      author       = {Fognini, Andreas and Salvatella, Gerard and Michlmayr,
                      Thomas and Wetli, C. and Ramsperger, Urs and Baehler, Thomas
                      and Sorgenfrei, Florian and Beye, Martin and Eschenlohr,
                      Andrea and Pontius, Niko and Stamm, Christian and Hieke,
                      Florian and Dell'Angela, Martina and de Jong, Sanne and
                      Kukreja, Roopali and Gerasimova, Natalia and Rybnikov,
                      Vladimir and Redlin, Harald and Raabe, J. and Foehlisch,
                      Alexander and Duerr, Hermann and Wurth, Wilfried and Pescia,
                      D. and Vaterlaus, Andreas and Acremann, Yves},
      title        = {{T}he role of space charge in spin-resolved photoemission
                      experiments},
      journal      = {New journal of physics},
      volume       = {16},
      number       = {4},
      issn         = {1367-2630},
      address      = {[Bad Honnef]},
      publisher    = {Dt. Physikalische Ges.},
      reportid     = {DESY-2014-02940},
      pages        = {043031},
      year         = {2014},
      abstract     = {Spin-resolved photoemission is one of the most direct ways
                      of measuring the magnetization of a ferromagnet. If all
                      valence band electrons contribute, the measured average spin
                      polarization is proportional to the magnetization. This is
                      even the case if electronic excitations are present, and
                      thus is of particular interest for studying the response of
                      the magnetization to a pump laser pulse. Here, we
                      demonstrate the feasibility of ultrafast spin-resolved
                      photoemission using free electron laser (FEL) radiation and
                      investigate the effect of space charge on the detected spin
                      polarization. The sample is exposed to the radiation of the
                      FEL FLASH in Hamburg. Surprisingly, the measured spin
                      polarization depends on the fluence of the FEL radiation: a
                      higher FEL fluence reduces the measured spin polarization.
                      Space-charge simulations can explain this effect. These
                      findings have consequences for future spin-polarized
                      photoemission experiments using pulsed photon sources.},
      cin          = {FLA / Eur.XFEL},
      ddc          = {530},
      cid          = {I:(DE-H253)FLA-20120731 / $I:(DE-H253)Eur_XFEL-20120731$},
      pnm          = {FLASH Beamline PG2 (POF2-54G16)},
      pid          = {G:(DE-H253)POF2-PG2-20130405},
      experiment   = {EXP:(DE-H253)F-PG2-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000335383300003},
      doi          = {10.1088/1367-2630/16/4/043031},
      url          = {https://bib-pubdb1.desy.de/record/169880},
}