Superconductivity at ferromagnetic domain walls in hybrid InAs/EuS/Al nanowires. Part 2: studied by magneto-transport

POSTER

Abstract

The effect of magnetism on superconductivity shows dramatically in ferromagnet/superconductor bilayers. Magnetic domains in the ferromagnet destroy Cooper pairs in the superconductor, while domain walls preserve them [1]. As the spin of the surviving Cooper pairs is expected to depend on the underlying magnetic texture, the integration of the bilayer films with semiconductors can serve as basis for novel devices such as spin-triplet Josephson junctions.

 

Here we characterize domain wall superconductivity (DWS) in bilayers of the magnetic insulator EuS and the superconductor Al fully wrapped around InAs semiconductor nanowires [2]. The characterization consists of magnetoresistance measurements done in individual nanowire devices in a dilution refrigerator, which complements scanning SQUID imaging of the magnetic properties of the individual nanowires presented in Part I of this work.

 

The dependence of the resistance on magnetic field strength and angle indicates the presence of DWS islands on top of vortex magnetic domain walls along the nanowires. Resistance jumps in time corroborate the discreteness of the superconductivity.

 

[1] Yang, Z. et al. (2004). Nat. Mater. 3, 793–798.

[2] Liu, Y. et al. (2020). Nano Lett. 20, 456–462.

*The project received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No. 832645.

Publication: This is a back-to-back presentation with the submission by Dr. Nabhanila Nandi entitled "Superconductivity at ferromagnetic domain walls in hybrid InAs/EuS/Al nanowires. Part 1: studied by scanning SQUID" for the same session.
Also, please do not schedule me at the same time as my other contributed work in Session 12.01.07.

Presenters

  • Juan Carlos Estrada Saldaña

    • Niels Bohr Institute, University of Copenhagen

Authors

  • Juan Carlos Estrada Saldaña

    • Niels Bohr Institute, University of Copenhagen

  • Nabhanila Nandi

    • Stanford University

  • Alexandros Vekris

    • Niels Bohr Institute, University of Copenhagen

  • Michelle Turley

    • Niels Bohr Institute, University of Copenhagen

  • Irene P Zhang

    • Stanford University

  • Yu Liu

    • Niels Bohr Institute, University of Copenhagen
    • University of Copenhagen and Microsoft Quantum Materials Lab Copenhagen
    • Niels Bohr Institute
    • University of Copenhagen
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen

  • Mario Castro

    • Universidad de Santiago de Chile

  • Martin Bjergfelt

    • Niels Bohr Institute, University of Copenhagen

  • Sabbir A Khan

    • Niels Bohr Institute, University of Copenhagen

  • Sebastian Allende

    • Universidad de Santiago de Chile
    • Niels Bohr Institute, University of Copenhagen

  • Peter Krogstrup

    • Microsoft Quantum Materials Lab Copenhagen
    • Niels Bohr Institute, University of Copenhagen
    • Quantum Materials Lab Copenhagen, Microsoft
    • Niels Bohr Institute, Copenhagen

  • Kathryn Moler

    • Department of Physics and Applied Physics, Stanford University
    • Stanford Univ
    • Stanford University
    • Department of Physics and Applied Physics, Stanford University, California 94305, USA

  • Kasper Grove-Rasmussen

    • Niels Bohr Institute, University of Copenhagen

  • Jesper Nygard

    • Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen