基于扫描nano-SQUID显微镜面向超导电子器件中磁通涡旋动力学的研究

超导电子器件中的磁通量子涡旋vortex的分布与运动规律是一个长期悬而未决的谜团，这些“看不到”的磁通量子涡旋vortex逐渐成为超导电子器件性能再上一个台阶的主要限制因素。利用扫描nano-SQUID显微镜技术能够直接观测到vortex的分布和运动轨迹，从而为我们打开了一扇通往超导vortex动力学研究的新大门。目前，申请人已经初步验证了利用扫描nano-SQUID显微镜对超导电路中vortex成像的可行性，因此本项目拟采用扫描nano-SQUID显微镜技术研究超导电子器件中vortex动力学，通过(1)进一步发展面向vortex成像的高分辨率nano-SQUID探针制备工艺；(2)对超导电路中vortex的形成、分布以及运动规律进行直观成像研究；(3)探索vortex、超导电流与电路缺陷之间内在影响机制；为排除vortex的干扰进一步提高超导电子器件性能提供可能的解决方案。

The formation and distribution of flux quanta vortex have been a long-term puzzle in the superconducting electronic device. These “invisible” vortex has become the leading factor that restricts the further improvement in the performance of many superconducting electronic devices. The scanning nano-SQUID microscope enables the direct imaging of the distribution and movement of the vortex, and it opens a new window to study the vortex dynamic in the superconducting electronic devices. Recently, we have just achieved the initial imaging of vortex inside the superconducting circuits. Therefore, we propose to study the vortex dynamics in the superconducting electronic devices by scanning nano-SQUID microscope. By working on the following aspects: 1. Fabrication of high-resolution nano-SQUID probe tip, 2. Direct imaging on the formation, distribution and movement of vortex, 3. Searching inner correlation between the vortex, superconducting current and defects, we hope to find possible solutions to exclude the disturbance of vortex on the performance of superconducting electronics.