Papers › Percolative supercurrent in superconductor-ferromagnetic insulator bilayers
Percolative supercurrent in superconductor-ferromagnetic insulator bilayers
A. Maiani, A. C. C. Drachmann, L. Galletti, C. Schrade, Y. Liu, R. Seoane Souto, S. Vaitiekėnas
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We report tunneling spectroscopy and transport measurements in superconducting Al and ferromagnetic-insulator EuS bilayers. The samples display remanent spin-splitting, roughly half the superconducting gap, and supercurrent transport above the average paramagnetic limit. We interpret this behavior as arising from the interplay between two characteristic length scales: the superconducting coherence length, ξ, and the magnetic domain size, d. By comparing experimental results to a theoretical model, we find ξ/d ≈10. In this regime, spin-averaging across the micromagnetic configuration can locally suppress superconductivity, resulting in percolative supercurrent flow.
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