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Percolative supercurrent in superconductor-ferromagnetic insulator bilayers

Maiani, A. ; Drachmann, A. C.C. ; Galletti, L. ; Schrade, C. ; Liu, Y. ; Souto, R. Seoane LU orcid and Vaitiekėnas, S. (2025) In Physical Review B 111(17).
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 ζ and the magnetic domain size d. By comparing experimental results to a theoretical model, we find ζ/d≈10. In this regime, spin averaging across the micromagnetic configuration can locally suppress superconductivity, resulting in percolative supercurrent flow.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
111
issue
17
article number
174509
publisher
American Physical Society
external identifiers
  • scopus:105004854556
ISSN
2469-9950
DOI
10.1103/PhysRevB.111.174509
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by "https://www.kb.se/samverkan-och-utveckling/oppen-tillgang-och-bibsamkonsortiet/bibsamkonsortiet.html"Bibsam.
id
43348730-2376-4d3f-9f36-d71f430f748d
date added to LUP
2025-08-06 15:56:32
date last changed
2025-08-06 15:57:51
@article{43348730-2376-4d3f-9f36-d71f430f748d,
  abstract     = {{<p>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 ζ and the magnetic domain size d. By comparing experimental results to a theoretical model, we find ζ/d≈10. In this regime, spin averaging across the micromagnetic configuration can locally suppress superconductivity, resulting in percolative supercurrent flow.</p>}},
  author       = {{Maiani, A. and Drachmann, A. C.C. and Galletti, L. and Schrade, C. and Liu, Y. and Souto, R. Seoane and Vaitiekėnas, S.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{17}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Percolative supercurrent in superconductor-ferromagnetic insulator bilayers}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.111.174509}},
  doi          = {{10.1103/PhysRevB.111.174509}},
  volume       = {{111}},
  year         = {{2025}},
}