We have developed a cryogenic two-dimensional magnetic imaging system that incorporates a sensitive dc SQUID detector. In this instrument, which we call the Scanning SQUID Microscope (SSM), 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 2μm. With our present input coil, spatial resolution of 20μm and a flux sensitivity at the sample of 10-5Φ0/Hz 1/2 is attainable. This system has been specifically designed to image the vortex structure and dynamics of weakly-coupled superconductor arrays.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering