Abstract:
We report transport measurements on Superconductor/Ferromagnet/Superconductor (S/F/S) junctions: Nb/Al/Gd/Al/Nb where gadolinium (Gd) is a weakly polarized ferromagnet. A sizeable critical current I c is observed in the I(V) characteristics. This current can be modulated by a weak magnetic field, as expected for a Josephson current. With these experiments, we establish that superconducting coherent transport survives across a small ferromagnetic layer. The penetration depth of Cooper pairs in Gd has been measured. An extensive study of the Josephson critical current in temperature for different thicknesses of magnetic compounds is presented. A comparison of transport measurements with S/N/S junction is given through measurements made on Nb/Al/Y/Al/Nb, where yttrium (Y) is used as non magnetic rare earth metal.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received 20 September 2000 and Received in final form 22 February 2001
Rights and permissions
About this article
Cite this article
Bourgeois, O., Gandit, P., Lesueur, J. et al. Josephson effect through a ferromagnetic layer. Eur. Phys. J. B 21, 75–80 (2001). https://doi.org/10.1007/s100510170215
Issue Date:
DOI: https://doi.org/10.1007/s100510170215