Seung-Kyun Lee
Physics Department, Princeton University
Femtotesla Magnetometry with Superconducting and Atomic Sensors
Wednesday, March 5, 2008, 12:00 p.m.
Refreshments at 11:45 p.m.
ABSTRACT
Measurement of feeble magnetic fields generated by localized sources finds many applications in physical sciences. In the past decades superconducting quantum interference devices (SQUIDs) have enabled many experiments in physics, materials sciences, and biology requiring magnetic field measurement on the order of a femtotesla. In the first half of the talk I will review the principles and applications of a dc SQUID magnetometer, with focus on its recent use for detecting signals in nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). In the second half, I will introduce recent developments in non-cryogenic optical/atomic magnetometers which are now poised to challenge traditional SQUID-based sensors in a number of experiments in the fields of biomagnetism and magnetic resonance.