Percolative supercurrent in superconductor-ferromagnetic insulator bilayers
arXiv:2404.17320 · doi:10.1103/PhysRevB.111.174509
Abstract
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, , and the magnetic domain size, . By comparing experimental results to a theoretical model, we find . In this regime, spin-averaging across the micromagnetic configuration can locally suppress superconductivity, resulting in percolative supercurrent flow.
14 pages, 11 figures
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