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We present the theoretical investigation of spontaneous magnetization of a coupled 2×2 πring array. It is indicated by free energy calculation that the system has the lowest energy when the four π rings have the full antiparallel configuration. Furthermore, the numerical evaluation results show that the system which favours full antiparallel spontaneous magnetization is a quantum effect deriving from the phase cohering of the superconducting quantum wavefunctions in the four superconducting rings through the shared Josephson junctions. 相似文献
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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. 相似文献
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聚甲基丙烯酸甲酯微流控分析芯片的简易热压制作法 总被引:18,自引:0,他引:18
提出聚甲基丙烯酸甲酯(PMMA)微流控分析芯片的一种简易热压制作法,研究了镍基、单晶硅和玻璃3种阳模制备芯片及芯片的封合条件.采用扫描电镜(SEM)和电荷耦合检测器(CCD)对PMMA芯片的微通道及其横截面形貌进行了表征.SEM图和CCD图表明实现了热压封接.测定了PMMA芯片的伏安曲线和电渗流,其电渗流值与文献报道值基本一致.本法制作的PMMA芯片用于电泳分离Cy5荧光染料,峰高RSD为2.2%(n=11),理论塔板数7.4×104m-1. 相似文献