Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 15: Superconductivity: Poster Session
TT 15.30: Poster
Dienstag, 26. Februar 2008, 14:00–18:00, Poster B
Ferromagnet/superconductor heterostructures with different magnetic anisotropies — Niraj Joshi1,2, Ajay Singh3, •Christoph Sürgers1,2, and Hilbert v. Löhneysen1,2,4 — 1Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany — 2Center for Functional Nanostructures, Universität Karlsruhe, D-76128 Karlsruhe, Germany — 3Bhabha Atomic Research Centre, Mumbai 400 085, India — 4Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe
In order to explore the interplay between magnetism and superconductivity in ferromagnet (F) / superconductor (S) heterostructures we have investigated various systems with different magnetic anisotropies by measurements of the transition temperature Tc, upper critical field Bc2, critical current Ic, and anomalous Hall effect. In the case where F is a Co/Pt multilayer with strong magnetic out-of-plane anisotropy, the superconducting properties of FSF triple layers depend on the relative orientation of the two F layer magnetizations. In a second approach we have modified the magnetic properties of ferrimagnetic Fe1−xGdx films in FS bilayers and FSF triple layers by small variations of the concentration x around x = 0.25 where the individual magnetizations of the Fe and Gd sublattices are nearly compensated. Finally, we present first magnetization measurements of epitaxially grown Co/Cu multilayers on Nb(110) single crystals in the superconducting and normal state.