Development of 1.3GHz high-T-c rf SQUID

doi:10.1088/1009-1963/13/1/019

Abstract

Abstract A new high-T_c (HT_c) rf SQUID working at around 1.3GHz has been developed to avoid electromagnetic interference such as growing mobile communication jamming. This new system works in a frequency range from 1.23 to 1.42GHz (centred at 1.3GHz), which is not occupied by commercial communication. The sensor used in the 1.3GHz rf SQUID is made of a HT_c coplanar superconducting resonator and a large-area HT_c superconducting film concentrator. We have achieved in the 1.3GHz HT_c rf SQUID system a minimal flux noise of $2.5×10^{-5}\varPhi_0/\sqrt{\rm Hz}$ and a magnetic field sensitivity of 38fT/$\sqrt{\rm Hz}$ in white noise range, respectively. The effective area of the concentrator fabricated on a 15×15mm² substrate is 1.35mm². It is shown that the 1.3GHz rf SQUID system has a high field sensitivity. Design and implementation of 1.3GHz HT_c rf SQUID offers a promising direction of rf SQUID development for higher working frequency ranges.

Keywords: 1.3GHz HT_c rf SQUID new structure sensor large effective

Received: 18 July 2003
Revised: 03 September 2003
Accepted manuscript online:

PACS:	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))
	74.78.Bz
	85.25.Am	(Superconducting device characterization, design, and modeling)

Fund: Project supported by the State Key Program of Basic Research of China (Grant No G1999064609), and the National High Technology Development Program of China (Grant No 2002AA306412).

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Liu Xin-Yuan (刘新元), Xie Fei-Xiang (谢飞翔), Meng Shu-Chao (孟树超), Dai Yuan-Dong (戴远东), Li Zhuang-Zhi (李壮志), Ma Ping (马平), Yang Tao (杨涛), Nie Rui-Juan (聂瑞娟), Wang Fu-Ren (王福仁), Development of 1.3GHz high-T-c rf SQUID 2004 Chinese Physics 13 100

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