Magnetic texture modulated superconductivity in superconductor/ferromagnet shells of semiconductor nanowires

Nabhanila Nandi; Juan Carlos Estrada Saldaña; Alexandros Vekris; Michelle Turley; Irene P. Zhang; Yu Liu; Mario Castro; Martin Bjergfelt; Sabbir A. Khan; Sebastián Allende; Peter Krogstrup; Kathryn Ann Moler; Kasper Grove-Rasmussen; Jesper Nygård

arXiv · 2601.22051

Magnetic texture modulated superconductivity in superconductor/ferromagnet shells of semiconductor nanowires

Nabhanila Nandi·Juan Carlos Estrada Saldaña·Alexandros Vekris·Michelle Turley·Irene P. Zhang·Yu Liu·Mario Castro·Martin Bjergfelt·Sabbir A. Khan·Sebastián Allende·Peter Krogstrup·Kathryn Ann Moler·Kasper Grove-Rasmussen·Jesper Nygård

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Abstract

In a one-dimensional ferromagnet-superconductor nanowire, magnetism can suppress superconductivity except where the Zeeman field is suppressed, for example domain wall superconductivity (DWS) near magnetic domain walls or multi-domain-averaged superconductivity (MDAS) in multi-domain states where the net magnetization over the coherence length averages to nearly zero. Here we study full-shell InAs/EuS/Al nanowires using scanning SQUID magnetometry and transport, and find superconductivity in the Al shell only when the EuS is in a multi-domain state, consistent with both DWS and MDAS, and absent in the saturated single-domain state. Scanning SQUID magnetometry further shows that the EuS magnetic texture is position dependent and reconfigurable by small changes in external magnetic field, including moving a well-defined domain wall at $\approx$5.5 $\mu$m/mT with sub-mT fields, implying that any associated localized superconducting region would likewise be movable. Such magnetic texture controlled superconductivity along a nanowire may be useful for topological qubits, Andreev spin qubits, superconducting logic, and memory devices.

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Nabhanila Nandi, Juan Carlos Estrada Saldaña, Alexandros Vekris, Michelle Turley, Irene P. Zhang, Yu Liu, Mario Castro, Martin Bjergfelt, Sabbir A. Khan, Sebastián Allende, Peter Krogstrup, Kathryn Ann Moler, Kasper Grove-Rasmussen, Jesper Nygård. 2026-01-29. Magnetic texture modulated superconductivity in superconductor/ferromagnet shells of semiconductor nanowires. https://arxiv.org/abs/2601.22051

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