Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 52: Magnetic Thin Films III
MA 52.4: Talk
Thursday, March 17, 2011, 11:45–12:00, HSZ 403
Structural and magnetic ordering of Cu2MnAl on MgO(001) studied by XAS and XMCD — •Bernhard Krumme1, Heike Herper1, Denise Erb2, Claudia Weis1, Anne Warland1, Carolin Antoniak1, Kurt Westerholt2, Peter Entel1, and Heiko Wende1 — 1Faculty of Physics and CeNIDE, University of Duisburg-Essen, D-47048 Duisburg, Germany — 2Faculty of Physics IV, Ruhr-University Bochum, D-44801 Bochum, Germany
Since many Heusler compounds are predicted to be halfmetallic ferromagnets, these materials are very promising candidates for ferromagnetic electrodes in spintronic devices. However, in ferromagnet/insulator hybrid structures used for these devices, the magnetic properties of the Heusler compounds strongly depend on the structural quality of the films and their interfaces. Therefore, we investigate the influence of chemical order on the electronic structure as well as the magnetic properties element-specifically by means of X-ray absorption and X-ray magnetic circular dichroism (XMCD) spectroscopy at the L2,3 absorption edges of Cu and Mn, respectively. Due to the element-specificity of these techniques, we are able to monitor the disorder-order transition at both the Cu and Mn sites and to identify a small, induced magnetic moment of 0.045 µB per Cu atom, which is in reasonable agreement with our SPR-KKR calculations [1].
– Supported by DFG (SFB 491) and Helmholtz-Zentrum Berlin.
[1] The Munich SPR-KKR package, version 3.6, H. Ebert et al.