Interference Phenomena and Long-Range Proximity Effect in Clean Superconductor-Ferromagnet Systems
A. S. Mel’nikov, A. V. Samokhvalov, S. M. Kuznetsova, A. I. Buzdin
DOI 10.1103/PhysRevLett.109.237006 · Physical Review Letters
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Abstract
We study peculiarities of the proximity effect in clean superconductor-ferromagnet structures caused by either the spatial or momentum dependence of the exchange field. Even a small modulation of the exchange field along the quasiparticle trajectories is shown to provide a long-range contribution to the supercurrent due to the specific interference of particle- and holelike wave functions. The momentum dependence of the exchange field caused by the spin-orbit interaction results in long-range superconducting correlations even in the absence of a ferromagnetic domain structure and can explain recent experiments on ferromagnetic nanowires.
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