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MA: Fachverband Magnetismus

MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)

MA 13.6: Poster

Dienstag, 24. März 2009, 10:15–13:00, P1A

Parallel XMCD and XRMS measurements with ALICE — •Stefan Buschhorn, Frank A. Brüssing, Denise Erb, Melanie Ewerlin, Radu Abrudan, and Hartmut Zabel — Experimentalphysik IV, Ruhr-Universität Bochum, 44780 Bochum

X-ray Magnetic Circular Dichroism (XMCD) is nowadays an established tool in thin film magnetism. The classical way to detect XMCD is by working either in transmission geometry or using Total Electron Yield (TEY) or Fluorescence Yield (FY) as a measure for absorption. These two signals provide surface sensitive and more bulk-like information on the magnetization, but no proper depth profile of the magnetisation. This problem is circumvented by measuring the X-ray Resonant Magnetic Scattering (XMRS) signal in Θ− 2Θ geometry. A depth-resolved magnetisation profile for both single- and multilayer samples is then available by tuning the energy to the resonant edges for the respective elements. Additionally, in scattering geometry the magnetic coupling between laterally structured samples is accessible with diffuse scattering.

We present data taken with the ALICE chamber, where all three signals can be measured at once: TEY, FY and XRMS. A comparison is made between the different absorption/reflection spectra, showing the main differences between drain current, fluorescence and reflectivity measurements for a standard sample (Py) and a multilayered spinvalve system (Co/Cr/Fe/Cr).