Tunneling density of states as a function of thickness in superconductor/ strong ferromagnet bilayers

Details Tunneling density of states as a function of thickness in superconductor/ strong ferromagnet bilayers Tunneling density of states as a function of thickness in superconductor/ strong ferromagnet bilayers

2005-04-27

arxiv.org/abs/cond-mat/0504739v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, content changed

Scientific paper

We have made an experimental study of the tunneling density of states (DOS) in strong ferromagnetic thin films (CoFe) in proximity with a thick superconducting film (Nb) as a function of $d_F$, the ferromagnetic thickness. Remarkably, we find that as $d_F$ increases, the superconducting DOS exhibits a scaling behavior in which the deviations from the normal-state conductance have a universal shape that decreases exponentially in amplitude with characteristic length $d^*\approx 0.4$ nm. We do not see oscillations in the DOS as a function of $d_F$, as expected from predictions based on the Usadel equations, although an oscillation in $T_c(d_F)$ has been seen in the same materials.

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