https://doi.org/10.1140/epjb/e2005-00361-6
Josephson current in superconductor/ferromagnet/ superconductor junctions
National Laboratory of Solid State Microstructures
and Department of Physics, Nanjing University, Nanjing, 210093
China
Corresponding author: a dyxing@nju.edu.cn
Received:
21
May
2005
Revised:
26
July
2005
Published online:
17
November
2005
The Bogoliubov-de Gennes equation and Nambu spinor Green's
function approach are applied to studying the Josephson current in
superconductor/ferromagnet/superconductor (S/F/S) Josephson
junctions in the clean limit. It is found that the critical
current exhibits a damped oscillation with the F thickness d,
the oscillation period equal to 
with 
the
coherence length of the F. The change of the critical current from
positive to negative is determined by factor 
with 
as the F-induced phase difference.
The exponent decay of the critical current is close related to
that of the superconductor order parameter in the F, both of them
having the same decay length.
PACS: 74.45.+c, – Proximity effects; Andreev effect; SN and SNS junctions / 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
