Title :
Design and implementation of a scanning SQUID microscope
Author :
Vu, L.N. ; Van Harlingen, D.J.
Author_Institution :
Dept. of Phys., Illinois Univ., Urbana, IL, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
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.<>
Keywords :
SQUIDs; flux-line lattice; magnetic field measurement; superconducting junction devices; SQUID detector; cryogenic two-dimensional magnetic imaging system; design; flux sensitivity; flux transformer; magnetic vortices; planar sample; positional resolution; scanning SQUID microscope; sensitive DC superconducting quantum interference device; spatial resolution; stepping-motor-controlled manipulator; vortex dynamics; vortex structure; weakly coupled superconductor arrays; Cryogenics; Detectors; Interference; Magnetic devices; Magnetic flux; Microscopy; SQUIDs; Spatial resolution; Superconducting devices; Superconducting magnets;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
