Design and implementation of a scanning SQUID microscope

A cryogenic two-dimensional magnetic imaging system that incorporates a sensitive DC superconducting quantum interference device (SQUID) detector is described. In this instrument, which is called the scanning SQUID microscope, a flux transformer coupled to the SQUID is scanned over the surface of a...

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Bibliographic Details
Published inIEEE transactions on applied superconductivity Vol. 3; no. 1; pp. 1918 - 1921
Main Authors Vu, L.N., Van Harlingen, D.J.
Format Journal Article Conference Proceeding
LanguageEnglish
Published New York, NY IEEE 01.03.1993
Institute of Electrical and Electronics Engineers
Subjects
Cryogenics
Detectors
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Interference
Magnetic components, instruments and techniques
Magnetic devices
Magnetic flux
Microscopy
Physics
Spatial resolution
SQUIDs
Superconducting devices
Superconducting magnets
Design
Biomedical equipment
Scanning microscope
Magnetometers
Nondestructive testing
Superconducting quantum interferometer device
Instrumentation
Imagery
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Summary:A cryogenic two-dimensional magnetic imaging system that incorporates a sensitive DC superconducting quantum interference device (SQUID) detector is described. In this instrument, which is called the scanning SQUID microscope, a flux transformer coupled to the SQUID is scanned over the surface of a planar sample by a room-temperature, stepping-motor-controlled manipulator with a positional resolution of about 2 mu m. With the present input coil, spatial resolution of 20 mu m and a flux sensitivity at the sample of 10/sup -5/ Phi /sub 0//Hz/sup 1/2/ is attainable. This system has been designed specifically to image the vortex structure and dynamics of weakly coupled superconductor arrays.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.233586