Abstract The time-dependent characteristics of a radio frequency superconducting quantum interference device (rf SQUID) involving two Josephson junctions connected in series are studied. First the dynamics of the total flux is given. Then the intrinsic flux noises in both nonhysteretic and hysteretic modes are investigated. The result shows that it is necessary to properly reduce the critical current ratio of the two junctions for low intrinsic noise level. When the critical current ratio is properly reduced, the intrinsic flux noise level of a two-junction rf SQUID is generally close to or slightly larger than that of a single junction rf SQUID, but no more than one order-of-magnitude.
Received: 12 July 2004
Revised: 09 August 2004
Accepted manuscript online:
Fund: Project supported by the Hi-Tech Research and Development Programme of China (Grant No 2002AA306412) and the Key Basic Research and Development Programme of China (Grant No G1999064609).
Cite this article:
Mao Bo (毛博), Dai Yuan-Dong (戴远东), Wang Fu-Ren (王福仁) Intrinsic flux noise level of an rf SQUID involving two Josephson junctions connected in series 2005 Chinese Physics 14 301
Development of 1.3GHz high-T-c rf SQUID 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), . Chin. Phys. B, 2004, 13(1): 100-104.
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