3D nano-bridge-based SQUID susceptometers for scanning magnetic imaging of quantum materials
Y. P. Pan, S. Y. Wang, X. Y. Liu, Y. S. Lin, L. X. Ma, Y. Feng, Z., Wang, L. Chen, Y. H. Wang
TL;DR
This paper introduces a novel 3D nano-bridge SQUID susceptometer for high-resolution magnetic imaging of quantum materials, demonstrating its capabilities in scanning magnetometry and susceptibility measurements.
Contribution
The paper presents a new design and fabrication of 3D Nb nano-bridge SQUIDs with integrated pickup loops for enhanced magnetic imaging of quantum materials.
Findings
Flux noise around 1 μΦ₀/√Hz at 100 Hz
Pickup loop diameter of 1 μm
Successful demonstration of scanning magnetometry and susceptometry
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 in diameter and the flux noise was around 1 at 100 Hz. We demonstrate scanning magnetometry, susceptometry and current magnetometry on some test samples using these nano-SQUIDs.
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