Volume 71, Number 4, August 2005
|Page(s)||679 - 685|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||14 July 2005|
Spin-valve magnetic sandwich in a Josephson junction
Faculty of Physics, M. V. Lomonosov Moscow State University Moscow 119992, Russia
2 Laboratoire Louis Néel, CNRS - BP 166, 38042 Grenoble Cedex 9, France
Accepted: 17 June 2005
The Josephson current is calculated in a SFNFS junction, which consists of two ferromagnetic layers (F) separated by a thin non-magnetic spacer (N) and connected to superconducting electrodes (S). Gorkov equations are solved taking into account the fact that s-d scattering is the main scattering mechanism in the ferromagnetic metals and it effectively destroys BCS correlation. It allows us to consider both strong and weak exchange field I: or ( is the relaxation time in F-layers). It is shown that the critical current J oscillates as a function of F-layers thickness and the oscillation period depends only on I. The s-d scattering effectively acts as an additional to the exchange magnetic-field mechanism for the suppression of BCS correlation in the ferromagnet. The s-d scattering is shown to be the reason of suppression of the Josephson current enhancement in the antiparallel configuration.
PACS: 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 72.25.-b – Spin polarized transport / 73.63.-b – Electronic transport in nanoscale materials and structures
© EDP Sciences, 2005
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