Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions
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Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions. / Razmadze, D.; Souto, R. Seoane; Galletti, L.; Maiani, A.; Liu, Yu; Krogstrup, P.; Schrade, C.; Gyenis, A.; Marcus, C. M.; Vaitiekenas, S.
In: Physical Review B, Vol. 107, No. 8, 081301, 13.02.2023.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions
AU - Razmadze, D.
AU - Souto, R. Seoane
AU - Galletti, L.
AU - Maiani, A.
AU - Liu, Yu
AU - Krogstrup, P.
AU - Schrade, C.
AU - Gyenis, A.
AU - Marcus, C. M.
AU - Vaitiekenas, S.
PY - 2023/2/13
Y1 - 2023/2/13
N2 - 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 pi and 0 phases within the superconducting window. We attribute the 0-pi 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 pi phases can be realized at zero external field by demagnetizing the wire.
AB - 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 pi and 0 phases within the superconducting window. We attribute the 0-pi 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 pi phases can be realized at zero external field by demagnetizing the wire.
KW - TRIPLET SUPERCONDUCTIVITY
KW - CRITICAL FIELD
KW - INSULATOR
U2 - 10.1103/PhysRevB.107.L081301
DO - 10.1103/PhysRevB.107.L081301
M3 - Journal article
VL - 107
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 8
M1 - 081301
ER -
ID: 340974494