Dresden 2011 – wissenschaftliches Programm

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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 36.86: Poster

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

A novel electron spectrometer for surface magnon scattering — •Rajeswari Jayaraman, Lutz Baumgarten, Bernd Küpper, Harald Ibach, and Claus Michael Schneider — Peter Grünberg Institut, Forschungszentrum Jülich, 52425 Jülich, Germany

Technical improvements in electron energy loss spectroscopy have enabled studies on the dispersion of spin waves (magnons) [1]. The previously designed spectrometer for surface magnon scattering featured a 90°/180° monochromator section and had the spin orientation perpendicular to the scattering plane and parallel to the surface [2]. Based on a calculation of the electron optical properties [3] we have designed a new electron spectrometer with spin orientation longitudinal to the electron beam and have implemented this spectrometer into an experimental set-up for studies on magnetic thin films. In agreement with theoretical calculations, a current of 3nA in direct beam has been achieved at 11meV resolution which is 6 times larger than for the previous instrument. First experimental results obtained with a new spectrometer will be reported.

[1] R. Vollmer et al., Phys. Rev. Lett. 91 (2003) 147201.

[2] H. Ibach et al., Rev. Sci. Instrum. 74 (2003) 4089.

[3] H. Ibach et al., Surface and Interface Analysis 38 (2006) 1615.