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Title: Scanning SQUID microscopy in a cryogen-free dilution refrigerator

Abstract

We report a scanning superconducting quantum interference device (SQUID) microscope in a cryogen-free dilution refrigerator with a base temperature at the sample stage of at least 30 mK. The microscope is rigidly mounted to the mixing chamber plate to optimize thermal anchoring of the sample. The microscope housing fits into the bore of a superconducting vector magnet, and our design accommodates a large number of wires connecting the sample and sensor. Through a combination of vibration isolation in the cryostat and a rigid microscope housing, we achieve relative vibrations between the SQUID and the sample that allow us to image with micrometer resolution over a 150 μm range while the sample stage temperature remains at base temperature. To demonstrate the capabilities of our system, we show images acquired simultaneously of the static magnetic field, magnetic susceptibility, and magnetic fields produced by a current above a superconducting micrometer-scale device.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]
  1. Cornell Univ., Ithaca, NY (United States). Lab. of Atomic and Solid-State Physics
  2. Max Planck Society, Dresden (Germany). Max Planck Inst. for Chemical Physics of Solids; Univ. of St. Andrews, St. Andrews, Scotland (United Kingdom). School of Physics and Astronomy
  3. Ecole Polytechnique Federale Lausanne (EPFL Switzerland). Inst. of Materials. Lab. of Quantum Materials (QMAT)
  4. Cornell Univ., Ithaca, NY (United States). Lab. of Atomic and Solid-State Physics; Cornell Univ., Ithaca, NY (United States). Kavli Inst. at Cornell for Nanoscale Science
Publication Date:
Research Org.:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1852039
Grant/Contract Number:  
SC0015947; DMR-1719875; MO 3077/1-1; 715730
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 92; Journal Issue: 8; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Instruments & Instrumentation; Physics; Vacuum apparatus; Magnetic susceptibility; Electronic noise; Alloys; Dilution refrigerators; Focused ion beam; Superconducting quantum interference device; Magnetic fields; Scanning SQUID microscopy; Vibration isolators

Citation Formats

Low, D., Ferguson, G. M., Jarjour, Alexander, Schaefer, Brian T., Bachmann, Maja D., Moll, Philip J. W., and Nowack, Katja C. Scanning SQUID microscopy in a cryogen-free dilution refrigerator. United States: N. p., 2021. Web. doi:10.1063/5.0047652.
Low, D., Ferguson, G. M., Jarjour, Alexander, Schaefer, Brian T., Bachmann, Maja D., Moll, Philip J. W., & Nowack, Katja C. Scanning SQUID microscopy in a cryogen-free dilution refrigerator. United States. https://doi.org/10.1063/5.0047652
Low, D., Ferguson, G. M., Jarjour, Alexander, Schaefer, Brian T., Bachmann, Maja D., Moll, Philip J. W., and Nowack, Katja C. Tue . "Scanning SQUID microscopy in a cryogen-free dilution refrigerator". United States. https://doi.org/10.1063/5.0047652. https://www.osti.gov/servlets/purl/1852039.
@article{osti_1852039,
title = {Scanning SQUID microscopy in a cryogen-free dilution refrigerator},
author = {Low, D. and Ferguson, G. M. and Jarjour, Alexander and Schaefer, Brian T. and Bachmann, Maja D. and Moll, Philip J. W. and Nowack, Katja C.},
abstractNote = {We report a scanning superconducting quantum interference device (SQUID) microscope in a cryogen-free dilution refrigerator with a base temperature at the sample stage of at least 30 mK. The microscope is rigidly mounted to the mixing chamber plate to optimize thermal anchoring of the sample. The microscope housing fits into the bore of a superconducting vector magnet, and our design accommodates a large number of wires connecting the sample and sensor. Through a combination of vibration isolation in the cryostat and a rigid microscope housing, we achieve relative vibrations between the SQUID and the sample that allow us to image with micrometer resolution over a 150 μm range while the sample stage temperature remains at base temperature. To demonstrate the capabilities of our system, we show images acquired simultaneously of the static magnetic field, magnetic susceptibility, and magnetic fields produced by a current above a superconducting micrometer-scale device.},
doi = {10.1063/5.0047652},
journal = {Review of Scientific Instruments},
number = 8,
volume = 92,
place = {United States},
year = {Tue Aug 24 00:00:00 EDT 2021},
month = {Tue Aug 24 00:00:00 EDT 2021}
}

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