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TT: Tiefe Temperaturen
TT 23: Posters Superconductivity, Solids at Low Temperature
TT 23.37: Poster
Monday, March 7, 2005, 14:00–18:00, Poster TU D
Alternative mechanism of the sign-reversal effect in Superconductor-Ferromagnet-Superconductor Josephson Junctions — •Alexandra Anishchanka1 and Anatoli Volkov1,2 — 1Theoretische Physik III, Ruhr-Universität Bochum, D-44801, Germany — 2Institute of Radioengineering and Electronics of the Russian Academy of Sciences, 103907 Moscow, Russia
We consider a simple model of a multidomain superconductor-ferromagnet-superconductor (SFS) Josephson junction. Sign-alternating magnetization M in domains leads to a spatial modulation of the phase difference φ (x). Due to this modulation the Josephson critical current Ic may have a different sign depending on the ratio of the magnetic flux in a domain, 4π Ma(2dF), and the magnetic flux quantum. Just this, but not a nonmonotonic dependence of the local critical current density jc, may be the reason for oscillations of the current Ic as a function of the F layer thickness 2dF or temperature, observed in experiments.