Magnetic microscopy using a liquid nitrogen cooled YBa[sub 2]Cu[sub 3]O[sub 7] superconducting quantum interference device

Journal Article · Mon Apr 26 04:00:00 EDT 1993 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.109448· OSTI ID:6662646

Black, R C; Mathai, A; Wellstood, F C ^[1]; Dantsker, E; Miklich, A H; Nemeth, D T; Kingston, J J; Clarke, J ^[2]

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1. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111 (United States)
2. Department of Physics, University of California, and Material Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)

We have developed a magnetic flux microscope which uses a liquid nitrogen cooled thin-film YBa[sub 2]Cu[sub 3]O[sub 7] dc superconducting quantum interference device (SQUID) to produce two-dimensional images of magnetic fields. The instrument operates as a scanning probe microscope with a spatial resolution of about 80 [mu]m and a field of view of about 100 mm[sup 2]. The equivalent magnetic field noise in the SQUID ranges from 80 pT Hz[sup [minus]1/2] at 1 Hz to 20 pT Hz[sup [minus]1/2] at 1 kHz, yielding a field resolution of about 200 pT in our images. We have used the microscope to image magnetic domains in ferromagnetic samples, small currents flowing in fine wires, and trapped flux and diamagnetic susceptibility in superconducting thin films.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6662646
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 62:17; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
IMAGES
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROSCOPY
MICROWAVE EQUIPMENT
NOISE
RESOLUTION
SENSITIVITY
SPATIAL RESOLUTION
SQUID DEVICES
SUPERCONDUCTING DEVICES