Incomplete Andreev reflection in a clean Superconductor/Ferromagnet/Superconductor junction

Abstract

We study the Josephson effect in a clean Superconductor-Ferromagnet-Superconductor junction for arbitrarily large spin polarizations. The Andreev reflection at a clean Ferromagnet-Superconductor interface is incomplete, and Andreev channels with a large incidence angle are progressively suppressed with increasing exchange energy. As a result, the critical current exhibits oscillations as a function of the exchange energy and of the length of the ferromagnet and has a temperature dependence which deviates from the one predicted by the quasiclassical theory.

4 pages, 4 figures, added references

References in corpus (2)

• Spontaneous supercurrent induced by ferromagnetic pi-junctions
• Stability of $\pi$ junction configurations in ferromagnet-superconductor heterostructures

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