Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 23: Posters Superconductivity, Solids at Low Temperature
TT 23.51: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU D
Oscillations of Superconducting Tc in Nb/Cux Ni1−x Bilayers With Subnanometer Thick Ferromagnetic Layer — •V. I. Zdravkov1,2, A. S. Sidorenko1,3, V. Ryazanov4, V. Oboznov4, M. Schreck2, S. Gsell2, S. Horn2, C. Mueller2, and A. Wixforth2 — 1Institute of Applied Physics, MD-2028 Kishinev, Moldova — 2Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany — 3Institute of Applied Physics, Universität Karlsruhe, D-76128 Karlsruhe — 4Institute of Solid State Physics, RU-Chernogolovka, Russia
Present work reports the results of proximity effect investigation for superconducting Nb/CuNi-bilayers with the thickness of the ferromagnetic layer ( Cux Ni1−x ) being in sub-nanometer scale. It was found a non-monotonic behavior of the critical temperature, Tc ,i.e. its growth with the ferromagnetic layer thickness increasing , dF,for series of samples with constant thicknesses of Nb layer, dNb = const. The samples were prepared on Si substrates using magnetron sputtering for Nb layer and RF-cathode sputtering for CuNi layer. Each set of the samples (with constant thickness of Nb layer and variable ferromagnetic layer thickness) was prepared within a one-deposition run using the special method of wedge-shaped films deposition technique. The thickness dF and the Cu/Ni-ratio were precisely measured by RBS spectroscopy. The possible reasons of the Tc non-monotonic behavior at the sub-nanometer range of dF variation are discussed.