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Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 36: Magnetic Measurement Techniques

MA 36.5: Talk

Thursday, March 14, 2013, 10:45–11:00, H3

The role of space charge in spin resolved photoemission experiments — •Gerard Salvatella1, Andreas Fognini1, Florian Sorgenfrei2, Martina Dell'Angela3, Martin Beye2, Florian Hieke3, Andrea Eschenlohr2, Sanne de Jong4, Roopali Kukreja4, Natalia Gerasimova5, Joerg Raabe6, Christian Stamm3, Urs Ramsperger1, Hermann Dürr4, Joachim Stöhr4, Alexander Föhlisch2, Wilfried Wurth3, Andreas Vaterlaus1, Thomas Michlmayr1, and Yves Acremann11Laboratorium für Festkörperphysik, ETH Zürich, Schweiz — 2HZB Berlin, Deutschland — 3Institut für Experimentalphysik, Universität Hamburg, Deutschland — 4SLAC, Stanford, USA — 5DESY, Hamburg, Deutschland — 6PSI, Villigen, Schweiz

Spin resolved photoemission from a solid is one of the most direct ways of measuring the magnetization. If the whole valence band is probed the measured average spin polarization is only weakly dependent on electronic excitations of the solid and represents therefore the magnetization of the sample. Here we present an experiment where the magnetization is measured by spin resolved photoemission of the cascade electrons from a thin Iron film. The sample is exposed to the radiation of the free electron laser (FEL) FLASH in Hamburg. The measured spin polarization depends on the fluence of the FEL radiation: Higher FEL fluence reduces the measured spin polarization. Space charge simulations show the most likely cause of this effect: Space charge of the electron cloud leaving the sample selectively suppresses the emission of lower energy photoelectrons which carry the largest spin polarization.

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