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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.64: Poster

Wednesday, March 28, 2012, 15:00–19:00, Poster B

Ferromagnet/superconductor hybrids with out-of-plane magnetization: comparison of current-in-plane and current-out-of-plane measurements — •Richard Montbrun1, Christoph Sürgers1, and Hilbert v. Löhneysen1,21Karlsruhe Institute of Technology, Physikalisches Institut and Center for Functional Nanostructures, D-76049 Karlsruhe — 2Karlsruhe Institute of Technology, Institut für Festkörperphysik, D-76021 Karlsruhe

Ferromagnet (F)/superconductor (S)/F hybrid structures - with S = Nb and Co/Pt multilayers as F electrodes - were fabricated by e-beam lithography and reactive ion-etching using silicon-nitride shadow masks on Si/SiO2. The sample layout allows four-point resistivity measurements with the current perpendicular to the F/S interface. In addition, planar F/S/F multilayers were prepared for current-in-plane measurements. The dependence of the superconductive transition temperature Tc on the relative orientation of the two F-layer magnetizations (parallel or antiparallel) was investigated for different S-layer thicknesses and transport currents. For current out of the plane Tc is always higher in the antiparallel configuration than in the parallel configuration whereas for current in the plane we observe a peculiar influence of the transport current amplitude on the spin-switch behavior. This indicates a different pair breaking in the two layouts.

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