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Title: Semiconductor–Ferromagnetic Insulator–Superconductor Nanowires: Stray Field and Exchange Field

Abstract

Nanowires can serve as flexible substrates for hybrid epitaxial growth on selected facets, allowing for the design of heterostructures with complex material combinations and geometries. In this work we report on hybrid epitaxy of freestanding vapor–liquid–solid grown and in-plane selective area grown semiconductor–ferromagnetic insulator–superconductor (InAs/EuS/Al) nanowire heterostructures. We study the crystal growth and complex epitaxial matching of wurtzite and zinc-blende InAs/rock-salt EuS interfaces as well as rock-salt EuS/face-centered cubic Al interfaces. Because of the magnetic anisotropy originating from the nanowire shape, the magnetic structure of the EuS phase is easily tuned into single magnetic domains. This effect efficiently ejects the stray field lines along the nanowires. With tunnel spectroscopy measurements of the density of states, we show that the material has a hard induced superconducting gap, and magnetic hysteretic evolution which indicates that the magnetic exchange fields are not negligible. These hybrid nanowires fulfill key material requirements for serving as a platform for spin-based quantum applications, such as scalable topological quantum computing.

Authors:
 [1];  [2];  [3];  [3];  [4];  [4];  [2]; ORCiD logo [1];  [1];  [2];  [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [1]
  1. Microsoft Quantum Materials Lab Copenhagen, Lyngby (Denmark); Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
  2. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
  3. Catalan Inst. of Nanoscience and Nanotechnology (ICN2), Barcelona (Spain)
  4. Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1605385
Grant/Contract Number:  
AC02-76SF00515; PTI-001; SEV-2017-0706; 2017 SGR 327; 716655; 722176
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 20; Journal Issue: 1; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Nanowire growth; hybrid nanowires; ferromagnetic exchange; superconducting proximity; hybrid epitaxy

Citation Formats

Liu, Yu, Vaitiekėnas, Saulius, Martí-Sánchez, Sara, Koch, Christian, Hart, Sean, Cui, Zheng, Kanne, Thomas, Khan, Sabbir A., Tanta, Rawa, Upadhyay, Shivendra, Cachaza, Martin Espiñeira, Marcus, Charles M., Arbiol, Jordi, Moler, Kathryn A., and Krogstrup, Peter. Semiconductor–Ferromagnetic Insulator–Superconductor Nanowires: Stray Field and Exchange Field. United States: N. p., 2019. Web. https://doi.org/10.1021/acs.nanolett.9b04187.
Liu, Yu, Vaitiekėnas, Saulius, Martí-Sánchez, Sara, Koch, Christian, Hart, Sean, Cui, Zheng, Kanne, Thomas, Khan, Sabbir A., Tanta, Rawa, Upadhyay, Shivendra, Cachaza, Martin Espiñeira, Marcus, Charles M., Arbiol, Jordi, Moler, Kathryn A., & Krogstrup, Peter. Semiconductor–Ferromagnetic Insulator–Superconductor Nanowires: Stray Field and Exchange Field. United States. https://doi.org/10.1021/acs.nanolett.9b04187
Liu, Yu, Vaitiekėnas, Saulius, Martí-Sánchez, Sara, Koch, Christian, Hart, Sean, Cui, Zheng, Kanne, Thomas, Khan, Sabbir A., Tanta, Rawa, Upadhyay, Shivendra, Cachaza, Martin Espiñeira, Marcus, Charles M., Arbiol, Jordi, Moler, Kathryn A., and Krogstrup, Peter. Tue . "Semiconductor–Ferromagnetic Insulator–Superconductor Nanowires: Stray Field and Exchange Field". United States. https://doi.org/10.1021/acs.nanolett.9b04187. https://www.osti.gov/servlets/purl/1605385.
@article{osti_1605385,
title = {Semiconductor–Ferromagnetic Insulator–Superconductor Nanowires: Stray Field and Exchange Field},
author = {Liu, Yu and Vaitiekėnas, Saulius and Martí-Sánchez, Sara and Koch, Christian and Hart, Sean and Cui, Zheng and Kanne, Thomas and Khan, Sabbir A. and Tanta, Rawa and Upadhyay, Shivendra and Cachaza, Martin Espiñeira and Marcus, Charles M. and Arbiol, Jordi and Moler, Kathryn A. and Krogstrup, Peter},
abstractNote = {Nanowires can serve as flexible substrates for hybrid epitaxial growth on selected facets, allowing for the design of heterostructures with complex material combinations and geometries. In this work we report on hybrid epitaxy of freestanding vapor–liquid–solid grown and in-plane selective area grown semiconductor–ferromagnetic insulator–superconductor (InAs/EuS/Al) nanowire heterostructures. We study the crystal growth and complex epitaxial matching of wurtzite and zinc-blende InAs/rock-salt EuS interfaces as well as rock-salt EuS/face-centered cubic Al interfaces. Because of the magnetic anisotropy originating from the nanowire shape, the magnetic structure of the EuS phase is easily tuned into single magnetic domains. This effect efficiently ejects the stray field lines along the nanowires. With tunnel spectroscopy measurements of the density of states, we show that the material has a hard induced superconducting gap, and magnetic hysteretic evolution which indicates that the magnetic exchange fields are not negligible. These hybrid nanowires fulfill key material requirements for serving as a platform for spin-based quantum applications, such as scalable topological quantum computing.},
doi = {10.1021/acs.nanolett.9b04187},
journal = {Nano Letters},
number = 1,
volume = 20,
place = {United States},
year = {2019},
month = {11}
}

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