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MA: Fachverband Magnetismus

MA 52: Magnetic Thin Films III

MA 52.4: Vortrag

Donnerstag, 17. März 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 L_2,3 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 µ_B 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.