Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Double percolation effects and fractal behavior in
  magnetic/superconducting hybrids   Perpendicular magnetic anisotropy ferromagnetic/ superconducting (FM/SC)
bilayers with a labyrinth domain structure are used to study nucleation of
superconductivity on a fractal network, tunable through magnetic history. As
clusters of reversed domains appear in the FM layer, the SC film shows a
percolative behavior that depends on two independent processes: the arrangement
of initial reversed domains and the fractal geometry of expanding clusters. For
a full labyrinth structure, the behavior of the upper critical field is typical
of confined superconductivity on a fractal network.

9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an