Application of atomic magnetometry in magnetic particle detection

Details Application of atomic magnetometry in magnetic particle detection Application of atomic magnetometry in magnetic particle detection

2006-09-22

arxiv.org/abs/physics/0609197v1

Physics

Instrumentation and Detectors

10 pages, 4 figures

Scientific paper

10.1063/1.2400077

We 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 um, multi-domain), a suspension of superparamagnetic magnetite particles (diameter \~1 um), and ferromagnetic cobalt nanoparticles (diameter ~10 nm, 120 kA/m magnetization). Estimated detection limits are 20 um diameter for a single cobalt particle at a water flow rate 30 ml/min, 5x10^3 magnetite particles at 160 ml/min, and 50 pl for the specific ferromagnetic fluid at 130 ml/min. Possible applications of our method are discussed.

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