Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Influence of the stray field of magnetic dot on the nucleation of
  superconductivity in a disk   We have investigated the nucleation of superconductivity in an Al mesoscopic
disk, with a magnetic dot on the top. The dot is magnetized perpendicularly,
and its magnetic field is inhomogeneous. The Al disk and magnetic dot are
separated by an insulating layer, which ensures that there is only magnetic
interaction between them. This hybrid superconductor/ferromagnet structure
exhibits the maximum critical temperature for a finite value of the
perpendicular applied magnetic field, which is parallel to the magnetization of
magnetic dot. We have found a good agreement between the experimental data for
the superconductor/normal metal phase boundary and the theoretical predictions
based on the Ginzburg-Landau theory.

15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph