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American Institute of Physics, Applied Physics Letters, 22(89), p. 224105

DOI: 10.1063/1.2400077

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Application of atomic magnetometry in magnetic particle detection

Journal article published in 2006 by S. J. Xu, M. H. Donaldson, A. Pines, D. Budker ORCID, S. M. Rochester, V. V. Yashchuk
This paper is available in a repository.
This paper is available in a repository.

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Abstract

The authors demonstrate the detection of magnetic particles carried by water in a continuous flow using an atomic magnetic gradiometer. Studies on three types of magnetic particles are presented: a single cobalt particle (diameter ∼150 μ m , multidomain), a suspension of superparamagnetic magnetite particles (diameter ∼1 μ m ), and ferromagnetic cobalt nanoparticles (diameter ∼10 nm ). Estimated detection limits are 20 μ m diameter for a single cobalt particle at a water flow rate of 30 ml / min , 5×103 magnetite particles at 160 ml / min , and 50 pl for the ferromagnetic fluid of cobalt nanoparticles at 130 ml / min . Possible applications of their method are discussed.