Berlin 2008 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 17: Poster: Trends in Ion Beam Technology, Magnetism in Thin Films, Functional Oxides, High-k Dielectric Materials, Semiconductor Nanophotonics, Nanoengineered Thin Films, Layer Deposition Processes, Layer Growth, Layer Properties, Thin Film Characterisation, Metal and Amorphous Layers, Application of Thin Films

DS 17.15: Poster

Dienstag, 26. Februar 2008, 09:30–13:30, Poster A

Microstructure and texture of Nb/SmCo₅ bilayers — •Rolf Schaarschuch¹, Silvia Haindl², Marianne Reibold¹, Volker Neu², Bernhard Holzapfel², Carl-Georg Oertel¹, Ludwig Schultz², and Werner Skrotzki¹ — ¹Institute of Structural Physics, Dresden University of Technology, D-01062 Dresden, Germany — ²Institute for Metallic Materials, IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany

Since the possibility of "magnetic pinning" of vortices was reported many attempts were made to join the obvious antagonistic couple in the form of multilayers with a certain superconductor/ferromagnet sequence. Magnetic pinning describes the interaction between vortices of a superconductor with domain walls of a ferromagnet situated directly above or below the superconductor. Thin film architectures of SmCo₅ on Nb and the reversed system both, with and without Cr-spacer layer between superconductor and ferromagnet, were fabricated by pulsed laser deposition. The microstructures and textures/epitaxial relationships of the grown films were characterized by TEM and X-ray diffraction, respectively. As a result, for the layer system Nb/SmCo₅ the epitaxial relationship MgO(001)[100]//Cr(001)[110]//Nb(001)[110]//Cr(001)[110]//SmCo₅(11-20)[0001]//Cr(001)[110] were found. With decreasing thickness of the Cr-spacer layer the SmCo₅ texture becomes random. In contrast, for the system SmCo₅/Nb with decreasing thickness of the Cr-spacer layer the Nb texture changes from the component given above to a <110>fibre. The findings are discussed with regard to lattice matching.