Low-noise serial high- Tc YBa2Cu3Oy superconducting quantum interference devices based on bicrystal junctions

Kuen Lin Chen, Shu-Hsien Liao, Yan Hong Chen, Herng-Er Horng, Li Min Wang, Hong-Chang Yang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The fabrication of high- Tc YBa2Cu3Oy (YBCO) superconducting quantum interference devices (SQUIDs) that produce low flux noise while maintaining a high fabrication yield continues to challenge scientists. In this paper, we report the characterization of low-noise serial high- Tc SQUIDs for biomagnetic applications. Epitaxial high- Tc YBCO thin films with a root-mean-square surface roughness less than 5 nm are optimized for the low-noise serial SQUID coupled to a common pickup coil to form magnetometers and gradiometers. Current-voltage curves, voltage-flux curves, and flux noise of SQUID devices are characterized. A smooth surface morphology across the bicrystal line is essential for SQUIDs to show good characteristics. The field sensitivity is improved by a factor of 2 1/2 with the designed serial SQUID array, which is coupled to a common pickup loop. This is demonstrated, and its fabrication yield is higher than 80% for devices with peak-to-peak voltage V-\rm PP\geq 15\ \mu\hbox{V}. The challenges and perspectives of the high- Tc serial SQUID array for biomagnetic applications are addressed and discussed.

Original languageEnglish
Article number6880340
JournalIEEE Transactions on Applied Superconductivity
Volume25
Issue number1
DOIs
Publication statusPublished - 2015 Feb 1

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Bicrystals
bicrystals
SQUIDs
low noise
interference
Pickups
Fluxes
Fabrication
Electric potential
fabrication
electric potential
Magnetometers
gradiometers
Surface morphology
sensors
curves
Surface roughness
magnetometers
surface roughness
Thin films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Low-noise serial high- Tc YBa2Cu3Oy superconducting quantum interference devices based on bicrystal junctions. / Chen, Kuen Lin; Liao, Shu-Hsien; Chen, Yan Hong; Horng, Herng-Er; Wang, Li Min; Yang, Hong-Chang.

In: IEEE Transactions on Applied Superconductivity, Vol. 25, No. 1, 6880340, 01.02.2015.

Research output: Contribution to journalArticle

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