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Scanning SQUID microscopy in a cryogen-free dilution refrigerator

Cornell Affiliated Author(s)

Author

D. Low
G.M. Ferguson
A. Jarjour
B.T. Schaefer
M.D. Bachmann
P.J.W. Moll
K.C. Nowack

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. © 2021 Author(s).

Date Published

Journal

Review of Scientific Instruments

Volume

92

Issue

8

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85113417232&doi=10.1063%2f5.0047652&partnerID=40&md5=28fb09dfd36c3bd30c0ac4b2da6f851d

DOI

10.1063/5.0047652

Group (Lab)

Katja Nowack Group

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