Nanoscale Superconducting Quantum Interference Device Sensors for Scanning Magnetic Microscopy

Superconducting quantum interference devices SQUIDs are among the most sensitive sensors for magnetic field nanoscale SQUIDs in particular also have high sensitivity to magnetic dipole fields Recently nanoSQUIDs have been fabricated on needle like quartz pipettes resulting in the capability of making field measurements within tens of nanometers from a sample surface at sub micron resolution This emergent technology has already demonstrated better than single electron magnetic dipole field sensitivities measurement of both in and out of plane magnetic fields and field independent sensitivities over a 0 5 T range When coupled with a scanning platform SOTs become powerful tools for studying properties of magnetic systems including superconducting vortex dynamics and superparamagnetism at LaAlO3 SrTiO3 and LaMnO3 SrTiO3 interfaces