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Development of 1.3GHz high-T-c rf SQUID |
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| Authors: | Liu Xin-Yuan Xie Fei-Xiang Meng Shu-Chao Dai Yuan-Dong Li Zhuang-Zhi Ma Ping Yang Tao Nie Rui-Juan and Wang Fu-Ren |
| Institution: | State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, and Department of Physics, Peking University, Beijing 100871, China; State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, and Department of Physics, Peking University, Beijing 100871, China; School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China |
| 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}Φ_0/\sqrt{Hz} and a magnetic field sensitivity of 38fT/\sqrt{Hz} in white noise range, respectively. The effective area of the concentrator fabricated on a 15×15mm^2 substrate is 1.35mm^2. 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 |
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