Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.5: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
A New Highly Efficient Spin Detector for Electron Spectroscopy — •Matthias Escher1, Nils B. Weber1, Michael Merkel1, Claus Michael Schneider2, and Lukasz Plucinski2 — 1Focus GmbH, Hünstetten, Germany — 2Peter Grünberg Institut, FZ Jülich, Germany
In order to overcome the restrictions in efficiency of conventional spin-detectors, e.g. Mott or SPLEED detectors, low energy electron scattering at a Fe(100)-p(1x1)O surface was first proposed by Bertacco et al. [1] as a system for highly efficient spin detection.
A new instrument based on that scheme is described here. It can be adapted to a spherical or a cylinder sector analyzer. An optimized optics and non-magnetic design enable the operation at very low energies without sacrificing the performance. The iron film is prepared in-situ on a W(100) crystal [2] without the need for separate sample preparation and exchange when using a MgO substrate [3]. We find an optimum working point at 6.5eV scattering energy consistent with [1]. First results obtained with UPS on Fe and Co films are shown.
With a Sherman-function of approx. 30% and a reflectivity up to 10% the figure of merit of this detector is more than one magnitude higher than conventional detectors. The oxidized iron film shows no degradation over days in UHV.
[1] R. Bertacco and F. Ciccacci, Phys. Rev B 59, 4207 (1999)
[2] A. Winkelmann, D. Hartung, H. Engelhard, C.-T. Chiang and J. Kirschner, Rev. Sci. Instrum 79, 083303 (2008)
[3] T. Okuda et al., Rev. Sci. Instrum 79, 123117 (2008)