Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological charge analysis of dynamic process of transition to
  N\'eel-type skyrmion: role of domain wall skyrmions   Magnetic skyrmions are intriguing topological spin textures that promise
future high-density spintronic devices. The creation of magnetic skyrmions has
been understood based on the energetics of skyrmions, but the detailed dynamic
process of the skyrmion creation remains unclear. Here topological evolution in
conversion from uneven domains to N\'eel-skyrmions is investigated using
micromagnetic simulations. We find that, rather than the overall topological
charge, annihilation of novel topological defects, i.e., recently suggested
domain wall skyrmions, dominantly govern the skyrmion creation process. Also,
the topological charge evolution is interpreted in terms of the number and the
combination of such topological defects.

5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con