Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Visualization of ferromagnetic domains in TbNi$_2$B$_2$C and
  ErNi$_2$B$_2$C single crystals: Weak ferromagnetism and its coexistence with
  superconductivity
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin