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. Löhneysen^1,2 — ¹Karlsruhe 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 T_c 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 T_c 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.