Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions

Abstract

We report supercurrent transport measurements in hybrid Josephson junctions comprised of 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.

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• Bulk Bogoliubov Fermi arcs in non-Hermitian superconducting systems
• Superconducting flux qubit with ferromagnetic Josephson $\pi$-junction operating at zero magnetic field
• Fermion-parity qubit in a proximitized double quantum dot
• Exceptional degeneracies in non-Hermitian Rashba semiconductors
• Nanoscale spin ordering and spin screening effects in tunnel ferromagnetic Josephson junctions
• Dissipationless Nonlinearity in Quantum Material Josephson Diodes
• Josephson effect and critical currents in trivial and topological full-shell hybrid nanowires
• Josephson junction π-0 transition induced by orbital hybridization in a double quantum dot
• Topological superconductivity in a magnetic-texture coupled Josephson junction
• Josephson diode effect in one-dimensional quantum wires connected to superconductors with mixed singlet-triplet pairing
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• Vortex dynamics induced by scanning SQUID susceptometry
• Spin-split superconductivity in spin-orbit coupled hybrid nanowires with ferromagnetic barriers
• P-wave pairing near a spin-split Josephson junction
• Percolative supercurrent in superconductor-ferromagnetic insulator bilayers
• DC Josephson effect between two Yu-Shiba-Rusinov bound states
• Odd-frequency Pairing in Josephson Junctions Coupled by Magnetic Textures