Kathryn Moler is assistant professor of physics at Stanford whose research focuses on the development of lacal magnetic probes and on their application to studying the physics of materials.  Scanning magnetic detectors, such as SQUID’s and Hall Probes, can be used in a variable-temperature magnetic imaging system to study everything from the bits on a floppy disk to vortices in superconductors. She talks with Alan Acosta. From the Series:InterChange