Tunneling density of states as a function of thickness in superconductor/strong ferromagnet bilayers
S. Reymond, P. SanGiorgio, M. R. Beasley, J. Kim, T. Kim, K. Char
DOI 10.1103/PhysRevB.73.054505 · Physical Review B
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Abstract
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 the ferromagnetic thickness dF. 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, which decreases exponentially in amplitude. The decay length d1 is approximately 0.4nm. We do not see oscillations in the DOS as a function of dF, as one would expect from predictions based on the Usadel equations using reasonable parameters.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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