Characteristics of the Superconducting-Quantum- Interference-Grating Magnetometer Consisting of Grain-Boundary Josephson Junctions

Author

Jeng, J.T. ; Huang, K.H. ; Wu, C.H. ; Chen, K.L. ; Chen, J.C. ; Yang, H.C.

Author_Institution

Nat. Taipei Univ. of Technol., Taipei

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

691

Lastpage

694

Abstract

The characteristics of the magnetometer based on the superconducting quantum interference grating (SQIG) consisting of multiple high-T_c grain-boundary Josephson junctions were investigated. In comparison with the two-junction superconducting quantum interference device (SQUID), an enhancement in the flux-to-voltage transfer function by a factor of 4.6 was achieved. Moreover, a sharp increase in the flux-to-current transfer function by a factor of 45 was observed for the case with the screening parameter much less than unity. The estimated white magnetic flux noise of the SQIG is lower than that of the conventional SQUID by one order of magnitude.

Keywords

SQUIDs; grain boundaries; magnetometers; Josephson junctions; SQUID; flux-to-current transfer function; flux-to-voltage transfer function; grain-boundary; magnetometer; superconducting quantum interference device; superconducting-quantum-interference-grating; Gratings; Interference; Josephson junctions; Magnetic flux; Magnetic noise; SQUID magnetometers; Superconducting device noise; Superconducting devices; Transfer functions; White noise; Grain-boundary Josephson junctions; high-$T_{rm c}$ SQUID; superconducting-quantum-interference grating;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.898270

Filename

4277474