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Noise properties of high-T-c superconducting flux transformers fabricated using chemical-mechanical polishing

Journal article
Authors Maxim Chukharkin
Alexei Kalaboukhov
Justin F. Schneiderman
Fredrik Öisjöen
O. Snigirev
Zonghe Lai
Dag Winkler
Published in Applied Physics Letters
Volume 101
Issue 4
Pages Article Number: 042602
ISSN 0003-6951
Publication year 2012
Published at
Pages Article Number: 042602
Language en
Keywords josephson-junctions, magnetic-resonance, magnetometers, planarization, yba2cu3o7-x, gradiometers, device, brain
Subject categories Condensed Matter Physics


Reproducible high-temperature superconducting multilayer flux transformers were fabricated using chemical mechanical polishing. The measured magnetic field noise of the flip-chip magnetometer based on one such flux transformer with a 9 x 9 mm(2) pickup loop coupled to a bicrystal dc SQUID was 15 fT/Hz(1/2) above 2 kHz. We present an investigation of excess 1/f noise observed at low frequencies and its relationship with the microstructure of the interlayer connections within the flux transformer. The developed high-T-c SQUID magnetometers may be advantageous in ultra-low field magnetic resonance imaging and, with improved low frequency noise, magnetoencephalography applications.

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