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Scanning SQUID microscopy in a cryogen-free dilution refrigerator

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/5.0047652· OSTI ID:1852039
 [1];  [2];  [2];  [2];  [3];  [4];  [5]
  1. Cornell Univ., Ithaca, NY (United States). Lab. of Atomic and Solid-State Physics; Cornell Univ., Ithaca, NY (United States)
  2. Cornell Univ., Ithaca, NY (United States). Lab. of Atomic and Solid-State Physics
  3. 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
  4. Ecole Polytechnique Federale Lausanne (EPFL Switzerland). Inst. of Materials. Lab. of Quantum Materials (QMAT)
  5. 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
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.
Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0015947
OSTI ID:
1852039
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 8 Vol. 92; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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