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Operation of a high-T-C SQUID gradiometer with a two-stage MEMS-based Joule-Thomson micro-cooler

Journal article
Authors A. Kalabukhov
E. J. de Hoon
K. Kuit
Ppppm Lerou
M. Chukharkin
Justin F. Schneiderman
S. Sepehri
A. Sanz-Velasco
Aldo Jesorka
Dag Winkler
Published in Superconductor Science & Technology
Volume 29
Issue 9
ISSN 0953-2048
Publication year 2016
Published at
Language en
Keywords superconducting quantum interference device, micro-coolers, high-T-C planar SQUID gradiometers, cryocooler, system, sensor, noise, Physics
Subject categories Electrical Engineering, Electronic Engineering, Information Engineering, Nano Technology


Practical applications of high-T-C superconducting quantum interference devices (SQUIDs) require cheap, simple in operation, and cryogen-free cooling. Mechanical cryo-coolers are generally not suitable for operation with SQUIDs due to their inherent magnetic and vibrational noise. In this work, we utilized a commercial Joule-Thomson microfluidic two-stage cooling system with base temperature of 75 K. We achieved successful operation of a bicrystal high-T-C SQUID gradiometer in shielded magnetic environment. The micro-cooler head contains neither moving nor magnetic parts, and thus does not affect magnetic flux noise of the SQUID even at low frequencies. Our results demonstrate that such a microfluidic cooling system is a promising technology for cooling of high-T-C SQUIDs in practical applications such as magnetic bioassays.

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