Characterization of Scanning SQUID Probes Based on 3D Nano-Bridge Junctions in Magnetic Field
Yin-Ping Pan1,2, Yue Wang1,3, Ruo-Ting Yang1,3, Yan Tang1, Xiao-Yu Liu1, Hua Jin1, Lin-Xian Ma1, Yi-Shi Lin2, Zhen Wang1,3, Jie Ren1,3*, Yi-Hua Wang2,4*, and Lei Chen1,3*
1Center for Excellence in Superconducting Electronics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China 2Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200438, China 3University of Chinese Academy of Sciences, Beijing 100049, China 4Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
Abstract：We develop superconducting quantum interference device (SQUID) probes based on 3D nano-bridge junctions for the scanning SQUID microscopy. The use of these nano-bridge junctions enables imaging in the presence of a high magnetic field. Conventionally, a superconducting ground layer has been employed for better magnetic shielding. In our study, we prepare a number of scanning SQUID probes with and without a ground layer to evaluate their performance in external magnetic fields. The devices show the improved magnetic modulation up to 1.4 T. It is found that the ground layer reduces the inductance, and increases the modulation depth and symmetricity of the gradiometer design in the absence of the field. However, the layer is not compatible with the use of the scanning SQUID probe in the field because it decreases its working field range. Moreover, by adding the layer, the mutual inductance between the feedback coil and the SQUID also decreases linearly as a function of the field.
. [J]. 中国物理快报, 2020, 37(8): 80702-.
Yin-Ping Pan, Yue Wang, Ruo-Ting Yang, Yan Tang, Xiao-Yu Liu, Hua Jin, Lin-Xian Ma, Yi-Shi Lin, Zhen Wang, Jie Ren, Yi-Hua Wang, and Lei Chen. Characterization of Scanning SQUID Probes Based on 3D Nano-Bridge Junctions in Magnetic Field. Chin. Phys. Lett., 2020, 37(8): 80702-.
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2020, Vol. 37 
