Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bloch-point-mediated topological transformations of magnetic domain
  walls in cylindrical nanowires   Cylindrical nanowires made of soft magnetic materials, in contrast to thin
strips, may host domain walls of two distinct topologies. Unexpectedly, we
evidence experimentally the dynamic transformation of topology upon wall motion
above a field threshold. Micromagnetic simulations highlight the underlying
precessional dynamics for one way of the transformation, involving the
nucleation of a Bloch-point singularity, however, fail to reproduce the reverse
process. This rare discrepancy between micromagnetic simulations and
experiments raises fascinating questions in material and computer science.

2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas