Scanning SQUID microscopy in a cryogen-free dilution refrigerator

D. Low*, G. M. Ferguson, Alexander Jarjour, Brian T. Schaefer, Maja D. Bachmann, Philip J. W. Moll, Katja C. Nowack*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.
Original languageEnglish
Article number083704
Number of pages7
JournalReview of Scientific Instruments
Issue number8
Early online date24 Aug 2021
Publication statusPublished - 24 Aug 2021


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