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Berlin 2005 – scientific programme

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MA: Magnetismus

MA 22: Magnetische dünne Schichten IV

MA 22.1: Talk

Tuesday, March 8, 2005, 10:30–10:45, TU H1012

Element-specific characterization of Co2MnGe/Au interfaces by XRMS — •Andre Bergmann, Johannes Grabis, Alexei Nefedov, Kurt Westerholt, and Hartmut Zabel — Institut für Experimentalphysik IV, Ruhr-Universität Bochum

Sputtered superlattices of the Heusler compound Co2MnGe with Au as spacer layer are studied by x-ray resonant magnetic reflectivity and diffuse scattering. Reflected intensities for both magnetic field directions in the longitudinal magneto-optical Kerr geometry were measured as a function of the photon energy at the first three superlattice reflections in the Co and Mn L2,3 absorption edge regions. Both, intensities and the corresponding asymmetries are simulated within a magneto-optical approach in order to determine an element-specific magnetization depth profile. Magnetically dead layers of up to 1 nm thickness are found at the Co2MnGe/Au interface explaining the relatively low magnetic moment observed in these systems. Resonant diffuse scattering yields information on the chemical and magnetic interface morphology. The in-plane correlation lengths of chemical and magnetic roughness are almost identical and correspond to the Co2MnGe crystallite size.

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