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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.110: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

High-Efficiency Multichannel-Spindetector — •Michaela Hahn, Bernd Petereit, Hans-Joachim Elmers, and Gerd Schönhense — Institut für Physik, Staudinger Weg 7, 55128 Mainz

The spinpolarisation analysis of electrons is a central demand in surface and solid state physics, especially for investigations of ferromagnetic materials. All state-of-the-art spindetectors work in a single-channel mode, i.e. monoenergetic and with only one detection angle. This leads to a very low efficiency in comparison with modern, parallel-detecting intensity analysers. We present a new type of spindetector with strongly improved efficiency by implementing a strategy for parallel multichannel detection.

The spinresolved photoelectron spectrometer comprises a hemispherical analyzer (Leybold EA10) and a helium discharge lamp (hν=21,23eV). Spindependent scattering at W(100) (asymmetry function S=0.45) yields a spinfiltered image of the analyzer exit plane, detected using a delayline detector (Surface Concept GmbH). A high-resolution spinfiltered image requires an acquisition time of minutes, whereas the same distribution with a state-of-the-art single channel detector would take several hours measuring time. A similar approach is used for the detection of spinfiltered momentum distributions [1].

Funded by Stiftung Rheinland-Pfalz für Innovation (project 886) and DFG (Scho 341/9-1)

Patent DE 10 2005 045 622 B4

[1] Ch. Tusche et al., this conference