https://www.nist.gov/publications/microfabricated-optically-pumped-magnetic-gradiometer
A microfabricated optically-pumped magnetic gradiometer | NIST
Nov 10, 2018 - We report on the development of a microfabricated atomic magnetic gradiometer based on optical spectroscopy of alkali atoms in the vapor phase.
optically pumpedmagnetic gradiometermicrofabricatednist