Feromagnetic "$π$"-junctions

Details Feromagnetic "$π$"-junctions Feromagnetic "$π$"-junctions

2002-01-08

arxiv.org/abs/cond-mat/0201104v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

We investigate Josephson coupling through a ferromagnetic thin film using Superconductor-Insulator-Ferromagnet-Superconductor planar junctions. Damped oscillations of the critical current are observed as a function of the ferromagnetic layer thickness. We show that they result from the exchange energy gained or lost by a quasiparticle Andreev-reflected at the ferromagnet-superconductor interface. The critical current cancels out at the transition from positive ("0") to negative ("$\pi$") coupling, in agreement with theoretical calculations.

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