Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Superconductivity: Poster Session

TT 21.34: Poster

Montag, 16. März 2015, 15:00–18:00, Poster B

Thickness Dependence of the Triplet Spin-Valve Effect in Superconductor-Ferromagnet Heterostructures — •Daniel Lenk1, Vladimir I. Zdravkov1,2, Jan Kehrle1, Günther Obermeier1, Roman Morari1,3, Hans-Albrecht Krug von Nidda1, Claus Müller1, Anatolie S. Sidorenko3, Siegfried Horn1, Reinhard Tidecks1, and Lenar Tagirov41Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany — 2Present address: Institut für angewandte Physik, Universität Hamburg, D-20355 Hamburg, Germany — 3D. Ghitsu Institute of Electronic Engineering and Nanotechnologies ASM, MD 2028 Kishinev, Moldova — 4Solid State Physics Department, Kazan Federal University, 420008 Kazan, Russia

We investigated the triplet spin-valve effect in nanoscale layered S/F1/N/F2/AF heterostructures with varying F1-layer thickness (where S=Nb is a singlet superconducting, F1=Cu41Ni59 and F2=Co a ferromagnetic, and N a normal-conducting, non-magnetic layer). The theory predicts a long-range, odd-in-frequency triplet component of superconductivity at non-collinear alignment of the magnetizations of F1 and F2. This triplet component exhausts the singlet state and, thus, lowers the superconducting transition temperature, Tc, yielding a global minimum of Tc close to the perpendicular mutual orientations of the magnetizations. We found an oscillating decay of Tc suppression, due to the generation of the triplet component, with increasing F1 layer thickness, which we discuss in the framework of recent theories. This work was supported by DFG Grant No. HO955/9-1.

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