Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precision determination of a fluxoid quantum's magnetic moment in a
  superconducting micro-ring   Using dynamic cantilever magnetometry and experimentally determining the
cantilever's vibrational mode shape, we precisely measured the magnetic moment
of a lithographically defined micron-sized superconducting Nb ring, a key
element for the previously proposed subpiconewton force standard. The magnetic
moments due to individual magnetic fluxoids and a diamagnetic response were
independently determined at T = 4.3 K, with a subfemtoampere-square-meter
resolution. The results show good agreement with the theoretical estimation
yielded by the Brandt and Clem model within the spring constant determination
accuracy.

18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin