We present magnetic detection of a single, 2m diameter cobalt microparticle using an atomic magnetometer based on a microfabricated vapor cell. These results represent an improvement by a factor of 105 in terms of the detected magnetic moment over previous work using atomic magnetometers to detect magnetic microparticles. The improved sensitivity is due largely to the use of small vapor cells. In an optimized setup, we predict detection limits of 0.17m3.
Bibliographical noteFunding Information:
Research was supported by the (U.S.) Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DE-AC02-05CH11231 (H.R.), by the National Science Foundation (NSF) under Award No. CHE-0957655 (D.M., D.B., and M.P.L.), and by the National Institute of Standards and Technology (NIST) (S.K. and J.K.). We gratefully acknowledge discussions with S. Xu and L. S. Bouchard. This work is a partial contribution of NIST, an agency of the US government, and is not subject to copyright.