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Novel HTS DC squid solutions for NMR applications

Journal article
Authors Maxim Chukharkin
Alexei Kalaboukhov
Justin F. Schneiderman
Fredrik Öisjöen
Magnus Jönsson
Minshu Xie
O. V. Snigirev
Dag Winkler
Published in NATO Science for Peace and Security Series B: Physics and Biophysics
Volume 2014
Pages 151-159
ISSN 1874-6500
Publication year 2014
Published at Institute of Neuroscience and Physiology
Pages 151-159
Language en
Subject categories Physical Sciences


We have developed a multilayer flux-transformer-based high-TC SQUID (flip-chip) magnetometer that improves signal-to-noise-ratios (SNR) in ultra-low field magnetic resonance (ulf-MR) recordings of protons in water. Direct ulf-MR-based benchmarking of the flip-chip versus a standard planar high-T C SQUID magnetometer resulted in improvement of the SNR by a factor of 2. This gain is attributable to the improved transformation coefficient (1.9 vs 5.3 nT/Φ0) that increased the signal available to the flip-chip sensor and to the lower noise at the measurement frequency (15 vs 25 fT/Hz1/2 at 4 kHz). The improved SNR can lead to better spectroscopic resolution, lower imaging times, and higher resolution in ulf-MR imaging systems based on high-T C SQUID technology. The experimental details of the sensors, calibration, and ulf-MR benchmarking are presented in this report.

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