Volume 51, Number 4, August II 2000
|Page(s)||434 - 440|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Non-equilibrium supercurrent through mesoscopic ferromagnetic weak links
Institut für Theoretische Festkörperphysik,
Universität Karlsruhe D-76128 Karlsruhe, Germany
2 Materials Physics Laboratory, Helsinki University of Technology FIN-02015 HUT, Finland
3 Quantum Transport Group, TU Delft - 2600 GA Delft, The Netherlands
Corresponding author: Tero.T.Heikkila@hut.fi
Accepted: 14 June 2000
We consider a mesoscopic normal metal, where the spin degeneracy is lifted by a ferromagnetic exchange field or Zeeman splitting, coupled to two superconducting reservoirs. As a function of the exchange field or the distance between the reservoirs, the supercurrent through this device oscillates with an exponentially decreasing envelope. This phenomenon is similar to the tuning of a supercurrent by a non-equilibrium quasiparticle distribution between two voltage-biased reservoirs. We propose a device combining the exchange field and non-equilibrium effects, which allows us to observe a range of novel phenomena. For instance, part of the field-suppressed supercurrent can be recovered by a voltage between the additional probes.
PACS: 74.50.+r – Proximity effects, weak links, tunnelling phenomena, and Josephson effects / 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect / 75.30.Et – Exchange and superexchange interactions
© EDP Sciences, 2000
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