TY  - JOUR
AU  - Fognini, Andreas
AU  - Salvatella, Gerard
AU  - Michlmayr, Thomas
AU  - Wetli, C.
AU  - Ramsperger, Urs
AU  - Baehler, Thomas
AU  - Sorgenfrei, Florian
AU  - Beye, Martin
AU  - Eschenlohr, Andrea
AU  - Pontius, Niko
AU  - Stamm, Christian
AU  - Hieke, Florian
AU  - Dell'Angela, Martina
AU  - de Jong, Sanne
AU  - Kukreja, Roopali
AU  - Gerasimova, Natalia
AU  - Rybnikov, Vladimir
AU  - Redlin, Harald
AU  - Raabe, J.
AU  - Foehlisch, Alexander
AU  - Duerr, Hermann
AU  - Wurth, Wilfried
AU  - Pescia, D.
AU  - Vaterlaus, Andreas
AU  - Acremann, Yves
TI  - The role of space charge in spin-resolved photoemission experiments
JO  - New journal of physics
VL  - 16
IS  - 4
SN  - 1367-2630
CY  - [Bad Honnef]
PB  - Dt. Physikalische Ges.
M1  - DESY-2014-02940
SP  - 043031
PY  - 2014
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000335383300003
DO  - DOI:10.1088/1367-2630/16/4/043031
UR  - https://bib-pubdb1.desy.de/record/169880
ER  -