Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Revealing 3D Magnetization of Thin Films with Soft X-ray Tomography:
  Closure Domains and Magnetic Singularities   The knowledge of how the magnetization looks inside a ferromagnet is often
hindered by the limitations of the available experimental methods that are
sensitive only to the surface regions or limited in spatial resolution. We
report the 3D tomographic reconstruction of the magnetization within a
ferromagnetic film of 240 nm in thickness using soft X ray microscopy and
magnetic dichroism. The film has periodic magnetic domains forming stripes and
closure domains found to be shifted from the stripe array by 1/4 of the period.
In addition, the bifurcations of the stripes, which act as inversion nuclei of
the magnetization, evidence in 3D meron singularities and Bloch points at the
interior of the film. This novel method can be easily extended to magnetic
stacks in spintronics applications and other singularities in films.

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The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
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The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci