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

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

2009-05-06

arxiv.org/abs/0905.0761v1

J. Phys. D: Appl. Phys. 42 (2009) 075005

Physics

Condensed Matter

Superconductivity

contains 5 figures

Scientific paper

10.1088/0022-3727/42/7/075005

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 $\xi_{F2}\approx 0.79\:{\rm {nm}}$ between 0 and $\pi$-Josephson phase coupling and a very short decay length $\xi_{F1}\approx 0.22\:{\rm {nm}}$ 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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