Work supported in part by US Department of Energy contract DE-AC02-76SF00515. Tunneling density of states as a function of thickness in superconductor/ strong ferromagnet bilayers
نویسندگان
چکیده
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 dF , the ferromagnetic thickness. Remarkably, we find that as dF 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∗ ≈ 0.4 nm. We do not see oscillations in the DOS as a function of dF , as expected from predictions based on the Usadel equations, although an oscillation in Tc(dF ) has been seen in the same materials.
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