Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Application of atomic magnetometry in magnetic particle detection   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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The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
16
The categories of this paper are: stat
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph