3D nano-bridge-based SQUID susceptometers for scanning magnetic imaging of quantum materials

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.

• Publication year

  2019

• Venue

  Nanotechnology

• Publication date

  2019-03-27

• Fields of study

  Materials Science, Physics, Medicine, Engineering

• Identifiers
  DOI 10.1088/1361-6528/ab1792arXiv 1903.11262PMID 30965292
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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