Scanned Squid Microscope with High-speed Electrical Connectivity

Published

January 26, 2026

Author(s)

Ian Haygood, Bochao Xu, John Biesecker, Michael Schneider

Abstract

We report on a cryogen-free scanned SQUID microscope operating at 4 K, with the capability of up to 40 RF (40 GHz) connections to a device under test. The system utilizes planar gradiometric SQUID loops which are fully shield except for a pair of pickup coils with radii as small as 250 nm, and have on chip field coils allowing for susceptometry. The system noise is 1.3 μΦ0/Hz1/2 at the base temperature of 3.3 K. Sample temperature is variable and both magnetometry and susceptibility measurements are possible with the sample temperature above 40 K. Through the use of a cryogenic chip socket and Silicon interposer round trip RF losses to a sample are 15 dB at 20 GHz. A combination of both active and passive magnetic shielding result in a residual magnetic field less than 100 nT inside of the cryostat.

Citation

Review of Scientific Instruments

Volume

97

Issue

1

Pub Type

Journals

Download Paper

https://doi.org/10.1063/5.0301774

Local Download

Keywords

Superconductivity, Scanned SQUID Microscopy

Citation

Haygood, I. , Xu, B. , Biesecker, J. and Schneider, M. (2026), Scanned Squid Microscope with High-speed Electrical Connectivity, Review of Scientific Instruments, [online], https://doi.org/10.1063/5.0301774, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=960631 (Accessed January 27, 2026)