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Title: Application of atomic magnetometry in magnetic particledetection

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.2400077· OSTI ID:918661

We demonstrate the detection of magnetic particles carriedby water in a continuous flow using an atomic magnetic gradiometer.Studies on three types of magnetic particles are presented: a singlecobalt particle (diameter ~;150 mum, multi-domain), a suspension ofsuperparamagnetic magnetite particles (diameter ~;1 mum), andferromagnetic cobalt nanoparticles (diameter ~;10 nm, 120 kA/mmagnetization). Estimated detection limits are 20 mum diameter for asingle cobalt particle at a water flow rate 30 ml/min, 5x103 magnetiteparticles at 160 ml/min, and 50 pl for the specific ferromagnetic fluidat 130 ml/min. Possible applications of our method arediscussed.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Director. Office of Science. Basic EnergySciences
DOE Contract Number:
DE-AC02-05CH11231
OSTI ID:
918661
Report Number(s):
LBNL-61614; APPLAB; R&D Project: 508601; BnR: KC0203010; TRN: US0805874
Journal Information:
Applied Physics Letters, Vol. 89, Issue 22; Related Information: Journal Publication Date: 2006; ISSN 0003-6951
Country of Publication:
United States
Language:
English

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