Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for a New Magnetoelectric Effect of Current-Induced
  Magnetization in a Toroidal Magnetic Ordered State of UNi$_4$B   Magnetization measurements under direct electric currents were performed for
toroidal magnetic ordered state of UNi$_4$B to test a recent theoretical
prediction of current-induced magnetization in a metallic system lacking local
inversion symmetry.We found that each of the electric currents parallel to
[$2\bar{1}\bar{1}0$] and [$0001$] in the hexagonal 4-index notation induces
uniform magnetization in the direction of [$01\bar{1}0$].The observed behavior
of the induced magnetization is essentially consistent with the theoretical
prediction; however it also shows an inconsistency suggesting that the
antiferromagnetic state of UNi$_4$B could not simply be regarded as a uniform
toroidal order in the ideal honeycomb layered structure.

12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph