Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique
TT 32.15: Poster
Mittwoch, 25. März 2009, 14:00–18:00, P1A
Spin mixing at Superconductor Ferromagnet Interfaces probed by non-local transport — •Florian Hübler1,2, Detlef Beckmann1, Jakob Brauer1, and Hilbert von Löhneysen2,3 — 1Forschungszentrum Karlsruhe, Institut für Nanotechnologie, P.O.-Box 3640, D-76021 Karlsruhe — 2Forschungszentrum Karlsruhe, Institut für Festkörperphysik, P.O.-Box 3640, D-76021 Karlsruhe — 3Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany
We present experimental results on non-local conductance in multiterminal hybrid structures, where two or more ferromagnetic (F) contacts are attached to a single superconductor (S). For contacts with an insulating (I) tunnel barrier, and at energies below the energy gap of the superconductor, the non-local conductance is determined by the competition of crossed Andreev reflection (CAR) and elastic cotunneling (EC). In FISIF structures, the contributions of CAR and EC are expected to depend on the orientation of the magnetisation of the F contacts. Recently, an asymmetric conductance signal as consequenc of a finite spin-mixing angle has been predicted [1]. We observe first signs for similar signals in our structures.
[1] Kalenkov and Zaikin, Phys. Rev. B 76, 224506 (2007)