Local Magnetic Imaging of Epitaxial Magnetic Insulator on Semiconductor Nanowire

ORAL

Abstract

The observation of properties related to Majorana bound states in indium arsenide (InAs) nanowire-epitaxial aluminum hybrid structure has been encouraging, but the need for a large external magnetic field makes their control and application very challenging. To locally introduce a magnetic exchange field, a single-crystalline ferromagnetic insulator europium sulfide (EuS) has been grown directly onto the InAs nanowire. Using a scanning Superconducting QUantum Interference Device (SQUID) microscope, we study the local magnetization and susceptibility of the hybrid magnetic structure on a sub-micron scale. Imaging local magnetic properties as a function of temperature and external field on multiple devices allow us to characterize homogeneity, anisotropy and domain formation, which will be crucial to further develop these topological superconducting devices.

*This work was supported by the Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Contract No. DE-AC02- 76SF00515

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Presenters

  • Zheng Cui

    • Stanford University

Authors

  • Zheng Cui

    • Stanford University

  • Sean J Hart

    • Harvard University
    • Stanford University

  • Liu Yu

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

  • Saulius Vaitiekenas

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

  • Charles M Marcus

    • Microsoft
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Microsoft Quantum Lab--Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Niels Bohr Institute, University of Copenhagen
    • Niels Bohr Institute
    • Center for Quantum Devices, Niels Bohr Institute
    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Peter Krogstrup

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

  • Kathryn Ann Moler

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