Characterization of Scanning SQUID Probes Based on 3D Nano-Bridge Junctions in Magnetic Field  

作　　者：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 Lei Chen 潘银萍;王悦;杨若婷;汤演;刘晓宇;金华;马林贤;林一石;王镇;任洁;王熠华;陈垒(Center for Excellence in Superconducting Electronics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China;Department of Physics and State Key Laboratory of Surface Physics,Fudan University,Shanghai 200438,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Research Center for Quantum Sciences,Shanghai 201315,China)

机构地区：[1]Center for Excellence in Superconducting Electronics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China [2]Department of Physics and State Key Laboratory of Surface Physics,Fudan University,Shanghai 200438,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Shanghai Research Center for Quantum Sciences,Shanghai 201315,China

出　　处：《Chinese Physics Letters》2020年第8期31-35,共5页中国物理快报（英文版）

基　　金：Supported by the National Key R&D Program of China(Grant Nos.2017YFF0206105,2016YFA0301002 and 2017YFA0303000);the Young Investigator Program of CAS(Grant No.2016217);the Frontier Science Key Programs of the CAS(Grant No.QYZDY-SSW-JSC033);the Strategic Priority Research Program of CAS(Grant No.XDA18000000);the Shanghai Municipal Science and Technology Major Project(Grant No.2019SHZDZX01);the National Natural Science Foundation of China(Grant No.11827805).

摘　　要：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.

关 键 词：SQUID layer PROBE 

分 类 号：TH744.3[机械工程—光学工程] O441.4[机械工程—仪器科学与技术]