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Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions

Razmadze, D. ; Souto, R. Seoane LU orcid ; Galletti, L. ; Maiani, A. ; Liu, Y. ; Krogstrup, P. ; Schrade, C. ; Gyenis, A. ; Marcus, C. M. and Vaitiekėnas, S. (2023) In Physical Review B 107(8).
Abstract

We report supercurrent transport measurements in hybrid Josephson junctions comprising semiconducting InAs nanowires with epitaxial ferromagnetic insulator EuS and superconducting Al coatings. The wires display a hysteretic superconducting window close to the coercivity, away from zero external magnetic field. Using a multi-interferometer setup, we measure the current-phase relation of multiple magnetic junctions and find an abrupt switch between π and 0 phases within the superconducting window. We attribute the 0-π transition to the discrete flipping of the EuS domains and provide a qualitative theory showing that a sizable exchange field can polarize the junction and lead to the supercurrent reversal. Both 0 and π phases can be... (More)

We report supercurrent transport measurements in hybrid Josephson junctions comprising semiconducting InAs nanowires with epitaxial ferromagnetic insulator EuS and superconducting Al coatings. The wires display a hysteretic superconducting window close to the coercivity, away from zero external magnetic field. Using a multi-interferometer setup, we measure the current-phase relation of multiple magnetic junctions and find an abrupt switch between π and 0 phases within the superconducting window. We attribute the 0-π transition to the discrete flipping of the EuS domains and provide a qualitative theory showing that a sizable exchange field can polarize the junction and lead to the supercurrent reversal. Both 0 and π phases can be realized at zero external field by demagnetizing the wire.

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author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
107
issue
8
article number
L081301
publisher
American Physical Society
external identifiers
  • scopus:85148330612
ISSN
2469-9950
DOI
10.1103/PhysRevB.107.L081301
language
English
LU publication?
yes
id
872af843-ff2f-4a76-9137-7bed842ebd47
date added to LUP
2023-03-03 13:57:48
date last changed
2025-10-14 09:30:05
@article{872af843-ff2f-4a76-9137-7bed842ebd47,
  abstract     = {{<p>We report supercurrent transport measurements in hybrid Josephson junctions comprising semiconducting InAs nanowires with epitaxial ferromagnetic insulator EuS and superconducting Al coatings. The wires display a hysteretic superconducting window close to the coercivity, away from zero external magnetic field. Using a multi-interferometer setup, we measure the current-phase relation of multiple magnetic junctions and find an abrupt switch between π and 0 phases within the superconducting window. We attribute the 0-π transition to the discrete flipping of the EuS domains and provide a qualitative theory showing that a sizable exchange field can polarize the junction and lead to the supercurrent reversal. Both 0 and π phases can be realized at zero external field by demagnetizing the wire.</p>}},
  author       = {{Razmadze, D. and Souto, R. Seoane and Galletti, L. and Maiani, A. and Liu, Y. and Krogstrup, P. and Schrade, C. and Gyenis, A. and Marcus, C. M. and Vaitiekėnas, S.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  number       = {{8}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.107.L081301}},
  doi          = {{10.1103/PhysRevB.107.L081301}},
  volume       = {{107}},
  year         = {{2023}},
}