Volume 54, Number 3, May 2001
|Page(s)||394 - 400|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Quantum spin fluctuations as a source of long-range proximity effects in diffusive ferromagnet-super conductor structures
Department of Applied Physics, Chalmers University
of Technology and Göteborg University -
SE-412 96 Göteborg, Sweden
2 B. I. Verkin Institute for Low Temperature Physics & Engineering National Academy of Science of Ukraine - 47 Lenin Ave. 310164 Kharkov, Ukraine
Accepted: 19 February 2001
We show that quantum spin fluctuations in inhomogeneous ferromagnets drastically affect the Andreev reflection of electrons and holes at a ferromagnet-superconductor interface. As a result, a strong long-range proximity effect appears, associated with electron-hole spin-triplet correlations and persisting on a length scale typical for non-magnetic materials, but anomalously large for ferromagnets.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.80.Fp – Point contacts; SN and SNS junctions / 85.35.Ds – Quantum interference devices
© EDP Sciences, 2001
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