Josephson current in superconductor/ferromagnet/ superconductor junctions |
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Authors: | L Y?Yang Z M?Zheng Email author" target="_blank">D Y?XingEmail author |
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Institution: | (1) National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, China |
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Abstract: | 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 2πξF with ξF the
coherence length of the F. The change of the critical current from
positive to negative is determined by factor cosφ′
with φ′=d/ξF 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. |
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Keywords: | |
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