Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Poster: Electronic Structure of Surfaces: Spectroscopy, Surface States
O 51.17: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster B
Development of a multichannel spin detector for photoelectron spectroscopy with hard x-rays — •Matthias Schmitt1, Alexander Wiegand1, Lenart Dudy1, Michael Sing1, Ralph Claessen1, Sergey Chernov2, Gerd Schönhense2, Andrei Gloskovskii3, Katrin Ederer3, Christoph Schlueter3, and Wolfgang Drube3 — 1Universität Würzburg, Physikalisches Institut and Röntgen Center for Complex Material Systems, 97074 Würzburg, Germany — 2Universität Mainz, Institut für Physik, 55128 Mainz, Germany — 3DESY Photon Science, 22607 Hamburg, Germany
Spin-resolved photoelectron spectroscopy is a powerful technique to directly probe the spin-polarized electronic structure of magnetic systems. However, conventional single channel spin detectors used for spin filtering and detection exhibit very low efficencies and, in addition, lack the possibility to benefit from the two-dimensional imaging capabilities of modern electron energy analyzers with respect to energy and angle. Thus, spin- and angle resolved measurements are in general cumbersome. This applies all the more for the hard x-ray regime where the photoabsorption cross sections are extremely small. Here we report on the development of a multichannel spin detector for hard x-ray photoelectron spectroscopy using a tungsten single crystal for spin-dependent low energy electron diffraction in 90∘ geometry. We also show first test measurements of magnetite with a spin polarization of -100% at the Fermi energy, performed at PETRA III in Hamburg, Germany.