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Published on: February 1, 2017
3D nano-bridge-based SQUID susceptometers for scanning magnetic imaging of quantum materials
Y P Pan1,2, S Y Wang1, X Y Liu2
1Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200438 People's Republic of China.
Abstract:
We designed and fabricated a new type of superconducting quantum interference device (SQUID) susceptometers for magnetic imaging of quantum materials. The 2-junction SQUID sensors employ 3D Nb nano-bridges fabricated using electron-beam lithography. The two counter-wound balanced pickup loops of the SQUID enable gradiometric measurement and they are surrounded by a one-turn field coil for susceptibility measurements. The smallest pickup loop of the SQUIDs were 1 μm in diameter and the flux noise was around 1 μФ0/√Hz at 100 Hz. We demonstrate scanning magnetometry, susceptometry and current magnetometry on some test samples using these nano-SQUIDs.
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