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.

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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