Abstract
A scanning SQUID microscope based on high-temperature superconductor (HTS)dc-SQUIDs was developed. An extremely soft magnetic amorphous foil was used to guidethe flux from room temperature samples to the liquid-nitrogen-cooled SQUID sensor andback. The flux guide passes through the pick-up loop of the HTS SQUID, providing animproved coupling of magnetic flux of the object to the SQUID. The device measures thez component (direction perpendicular to the sample surface) of the strayfield of the sample, which is rastered with submicron precision in thex–y direction by a motorized computer-controlled scanning stage. A lateral resolution better than10 µm, with a fieldresolution of about 0.6 nT Hz−1/2 was achieved for the determination of the position of the current carrying thin wires. Thepresence of the soft magnetic foil did not significantly increase the flux noise of the SQUID.
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