High-T-c superconducting quantum interference devices: Status and perspectives
Resource
JOURNAL OF APPLIED PHYSICS,104,011101.
Journal
Journal of Applied Physics
Pages
11101
Date Issued
2008-07
Date
2008-07
Author(s)
Yang, Hong-Chang
Chen, Ji-Chen
Chen, Kuen-Lin
Wu, Chiu-Hsien
Horng, Herng-Er
Yang, S. Y.
Abstract
In this paper, an overview of the current status of high-Tc superconducting quantum interference devices (SQUIDs), from device engineering to biomagnetic applications, is given. The authors offer a description of the current status of SQUID sensors, challenges encountered, and the solution of fabricating SQUID sensors with low flux noises. The current challenge that we face is to fabricate high-Tc SQUIDs that are not only more reproducible than the current technology but also capable of providing a high IcRn product and fabricating SQUID with high yield. Improvement of flux noises and fabrication yield in the integrated multichoices directly coupled SQUID magnetometer or gradiometer with series SQUID array are presented. High-Tc SQUID magnetometers exhibiting magnetic field sensitivity of ∼30–50fT∕Hz1∕2 or better at 100Hz was demonstrated by incorporating serial SQUID into the pickup loop of the magnetometers. New technologies currently being developed and applications for high-Tc SQUIDs are addressed.
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