%0 Journal Article
%A Sprungmann, D.
%A Westerholt, K.
%A Zabel, H.
%A Weides, M.
%A Kohlstedt, H.
%T Josephson tunnel junctions with ferromagnetic Fe0.75Co0.25 barriers
%J Journal of applied physics
%V 42
%@ 0021-8979
%C Melville, NY
%I American Institute of Physics
%M PreJuSER-3988
%P 075005
%D 2009
%Z The authors thank R Waser, G Pickartz and R Borowski for support. DS, KW and HZ acknowledge financial support by SFB-491, and MW by project WE 4359/1-1.
%X 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 xi(F2) approximate to 0.79 nm between 0 and pi-Josephson phase coupling and a very short decay length xi(F1) approximate to 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 d(F.)
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000264385900011
%R 10.1088/0022-3727/42/7/075005
%U https://juser.fz-juelich.de/record/3988