Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vortex-antivortex nucleation in magnetically nanotextured
  superconductors: Magnetic-field-driven and thermal scenarios   Within the Ginzburg-Landau formalism, we predict two novel mechanisms of
vortex-antivortex nucleation in a magnetically nanostructured superconductor.
Although counterintuitive, nucleation of vortex-antivortex pairs can be
activated in a superconducting (SC) film covered by arrays of submicron
ferromagnets (FMs) when exposed to an external homogeneous magnetic field. In
another scenario, we predict the thermal induction of vortex-antivortex
configurations in SC/FM samples. This phenomenon leads to a new type of
Little-Parks oscillations of the FM magnetization-temperature phase boundary of
the superconducting film.

21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci