Vortex Electronics

点击翻译按钮获取中文摘要

The Priority area "Vortex Electronics" was settled from 1998 to 2000, just for three years until the end of the 20th century. During this period, the research project placed three items to be explored : (1) the basic research and visualization of vortex, (2) progressive application to vortex electronics and (3) establishment of advanced technologies for oxides and oxide superconductors.Ultrashort laser pulse probe method was establihed to visualize and control the vortices via modulation of supercurrent by laser irradiation. Modified Bitter's method was proposed and the improved spatial resolution limit was experimentally verified. Through this proposal, the temporal dynamics of the vortex in the HTSC thin films were observed clearly in YBCO and BSCCO. The most outstanding result was the discovery of charged vortex in the oxide superconductors. So far, in the metal superconductors, every one has believed that the normal-core of the vortex is electrically neutral. This concept was found not to be conveyed to the oxide superconductors.Vortex dynamics were closely investigated by several sensitive methods and explored the origin of fluctuation noise. On the basis of these knowledges, low noise SQUIDs were fabricated and investigated. SQUID microscope, SQUID bio-sensor and "Open-SQUID" were proposed and actually fabricated. High speed RSFQ application was checked and demonstrated at around 30 GHz.New PLD technology was proposed and named Aurora-PLD. It is very suitable to grow thin films at lower temperatures.