Volume 56, Number 4, November 2001
|Page(s)||590 - 595|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 December 2003|
Inverse proximity effect in superconductors near ferromagnetic material
Low Temperature Laboratory, Helsinki University of Technology
P.O.Box 2200, FIN-02015 HUT, Finland
2 Materials Physics Laboratory, Helsinki University of Technology P.O.Box 2200, FIN-02015 HUT, Finland
3 Institut für Theoretische Festkörperphysik, Universität Karlsruhe D-76128 Karlsruhe, Germany
Corresponding author: Mika.Sillanpaa@iki.fi
Accepted: 27 August 2001
We study the electronic density of states in a mesoscopic superconductor near a transparent interface with a ferromagnetic metal. In our tunnel spectroscopy experiment, a substantial density of states is observed at sub-gap energies close to a ferromagnet. We compare our data with detailed calculations based on the Usadel equation, where the effect of the ferromagnet is treated as an effective boundary condition. We achieve an excellent agreement with theory when non-ideal quality of the interface is taken into account.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects
© EDP Sciences, 2001
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