Spin-valve magnetic sandwich in a Josephson junctionстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: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 3d ferromagnetic metals and it effectively destroys BCS correlation. It allows us to consider both strong and weak exchange field I: I tau(f) >> 1 or I tau(f) << 1 (tau(f) 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.