Josephson tunnel junctions with ferromagnetic Fe0.75Co0.25 barriers

Sprungmann, D., Westerholt, K., Zabel, H., Weides, M. and Kohlstedt, H. (2009) Josephson tunnel junctions with ferromagnetic Fe0.75Co0.25 barriers. Journal of Physics D: Applied Physics, 42(7), 075005. (doi:10.1088/0022-3727/42/7/075005)

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Abstract

Josephson tunnel junctions with the strong ferromagnetic alloy Fe0.75Co0.25 as the barrier material were studied. The junctions were prepared with high quality down to a thickness range of a few monolayers of Fe–Co. An oscillation length of ξF2 ≈ 0.79 nm between 0 and π-Josephson phase coupling and a very short decay length ξF1 ≈ 0.22 nm for the amplitude of the superconducting pair wave function in the Fe–Co layer were determined. The rapid damping of the pair wave function inside the Fe–Co layer is caused by the strong ferromagnetic exchange field and additional magnetic pair breaking scattering. Josephson junctions with Fe–Co barriers show a significantly increased tendency towards magnetic remanence and flux trapping for larger thicknesses dF.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Weides, Professor Martin
Authors: Sprungmann, D., Westerholt, K., Zabel, H., Weides, M., and Kohlstedt, H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Physics D: Applied Physics
Publisher:IOP Publishing
ISSN:0022-3727
ISSN (Online):1361-6463
Published Online:20 March 2009

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