Improvement of Ultra-Low Field Magnetic Resonance Recordings With a Multilayer Flux-Transformer-Based High-T-C SQUID Magnetometer
Artikel i vetenskaplig tidskrift, 2013

We have developed a multilayer flux-transformer-based high-T-C 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/Phi(0)) that increased the signal available to the flip-chip sensor and to the lower noise at the measurement frequency (15 vs 25 fT/Hz(1/2) 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.

nuclear magnetic resonance

high temperature superconductors

Flip-chip

SQUIDs

superconducting

Författare

Maxim Chukharkin Leonidovich

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Alexei Kalaboukhov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Justin Schneiderman

Göteborgs universitet

Fredrik Öisjöen

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Magnus J Jönsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Minshu Xie

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

O. V. Snigirev

Moscow State University

Dag Winkler

Chalmers, Mikroteknologi och nanovetenskap (MC2)

IEEE Transactions on Applied Superconductivity

1051-8223 (ISSN)

Vol. 23

Ämneskategorier

Nanoteknik

DOI

10.1109/tasc.2012.2234332