Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Searching for New Spin-Dependent Interactions with SmCo$_5$ Spin Sources
  and a SERF Comagnetometer   We propose a novel method to search for possible new macro-scale spin- and/or
velocity-dependent forces (SVDFs) based on specially designed SmCo$_5$ spin
sources and a spin exchange relaxation-free (SERF) comagnetometer. A simulation
shows that, by covering a SmCo$_5$ permanent magnet with a layer of pure iron,
a high net spin density source of about $1\times 10^{22}$/cm$^3$ could be
obtained. Taking advantages of the high spin density of this iron-shielded
SmCo$_5$ and the high sensitivity of the SERF, the proposed method could set up
new limits of greater than 10 orders of magnitude more sensitive than those
from previous experiments or proposals in exploring SVDFs in force ranges
larger than 1 cm.

19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th