Published July 26, 2019 | Version v1
Journal article Metadata-only

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

Creators

  • 1. Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200438 (China)
  • 2. Center for Excellence in Superconducting Electronics, State Key Laboratory of Functional Material for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050 (China)

Description

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. (paper)

Availability note (English)

Available from http://dx.doi.org/10.1088/1361-6528/ab1792

Additional details

Identifiers

DOI
10.1088/1361-6528/ab1792;

Publishing Information

Journal Title
Nanotechnology (Print)
Journal Volume
30
Journal Issue
30
Journal Page Range
[7 p.]
ISSN
0957-4484

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
51050988
Subject category
S77: NANOSCIENCE AND NANOTECHNOLOGY;
Descriptors DEI
ELECTRIC COILS; ELECTRON BEAMS; NANOSTRUCTURES; NIOBIUM; NOISE; QUANTUM SYSTEMS; SENSORS; SQUID DEVICES; SUPERCONDUCTING JUNCTIONS
Descriptors DEC
BEAMS; ELECTRICAL EQUIPMENT; ELECTRONIC EQUIPMENT; ELEMENTS; EQUIPMENT; FLUXMETERS; LEPTON BEAMS; MEASURING INSTRUMENTS; METALS; MICROWAVE EQUIPMENT; PARTICLE BEAMS; REFRACTORY METALS; SUPERCONDUCTING DEVICES; TRANSITION ELEMENTS; TUNNEL JUNCTIONS