Regensburg 2007 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 8: Superconductivity - Poster Session
TT 8.24: Poster
Monday, March 26, 2007, 14:00–17:45, Poster A
Superconducting transport properties of Co-Pt/Nb/Co-Pt triple layers with perpendicular magnetic anisotropy — •Ajay Singh1, Christoph Sürgers1,2, and Hilbert v. Löhneysen1,2,3 — 1Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe — 2Center for Functional Nanostructures, Universität Karlsruhe, D-76128 Karlsruhe — 3Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe
In a superconducting spin switch the transition temperature Tc of a superconductor (S) sandwiched between two ferromagnets (F) depends on the relative orientation of the F layer magnetizations. We report on the superconducting transport properties of FSF triple layers, where F is a Co-Pt multilayer with perpendicular magnetic anisotropy and S is Nb. Tc is lower for the antiparallel (AP) compared to the parallel (P) state. This is explained by the enhanced reflection of spin-polarized charge carriers into the S layer for the AP state. Tc is independent of the magnetization orientation if an insulating barrier is introduced between F and S at each of the two interfaces. We also provide additional data in order to prove that the Tc difference is likely to be related to the proximity effect and not due to residual magnetic stray fields of the F layers.