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arXiv · 0905.0761

Josephson tunnel junctions with ferromagnetic $\Fe_{0.75}\Co_{0.25}$ barriers

D. Sprungmann·K. Westerholt·H. Zabel·M. Weides·H. Kohlstedt
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Abstract

Josephson tunnel junctions with the strong ferromagnetic alloy $\Fe_{0.75}\Co_{0.25}$ 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 $ξ_{F2}\approx 0.79\:{\rm {nm}}$ between 0 and $π$-Josephson phase coupling and a very short decay length $ξ_{F1}\approx 0.22\:{\rm {nm}}$ 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 $d_{F}$.

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D. Sprungmann, K. Westerholt, H. Zabel, M. Weides, H. Kohlstedt. 2009-05-06. Josephson tunnel junctions with ferromagnetic $\Fe_{0.75}\Co_{0.25}$ barriers. https://doi.org/10.1088/0022-3727/42/7/075005

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