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

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 $d_F$, 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 $d^{\ast }\approx 0.4$ 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.

4 pages, 4 figures, content changed

References in corpus (3)

• Proximity effects in superconductor-ferromagnet heterostructures
• Scanning Tunneling Spectroscopy of the superconducting proximity effect in a diluted ferromagnetic alloy
• Quantitative analysis of proximity effect in $Nb/C{o}_{60}F{e}_{40}$, Nb/Ni, and $Nb/C{u}_{40}N{i}_{60}$ bilayers

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• Tunneling conductance in Superconductor/Ferromagnet junctions: a self consistent approach
• Density of states in SF bilayers with arbitrary strength of magnetic scattering
• Superconducting/ferromagnetic diffusive bilayer with a spin-active interface: a numerical study
• Density of states and current-voltage characteristics in SIsFS junctions
• Influence of Magnetic Order on Proximity-Induced Superconductivity in Mn Layers on Nb(110) from First Principles