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TT: Tiefe Temperaturen

TT 8: Mesoskopische Systeme I

TT 8.5: Talk

Tuesday, March 12, 2002, 10:45–11:00, H20

Absolute Spin-Valve Effect with Superconducting Proximity Structures — •Wolfgang Belzig¹, Daniel Huertas-Hernandez², and Yuli V. Nazarov² — ¹Departement für Physik, Universität Basel, Schweiz — ²Department of Applied Physics, TU Delft, Niederlande

We investigate spin dependent transport in hybrid superconductor(S)–normal-metal(N)–ferromagnet(F) structures. In particular we show, that the spectral properties of a normal metal sandwiched between a ferromagnetic insulator and a superconductor depend on the polarization of the ferromagnet. Following this observation, we propose to measure a voltage-controled absolute spin-valve effect in a system consisting of two coupled SNF-trilayer structures. Our results are also valid for non-collinear magnetic configurations of the ferromagnets.