Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Bloch-point domain walls in cylindrical magnetic
  nanowires   Topological protection is an elegant way of warranting the integrity of
quantum and nanosized systems. In magnetism one example is the Bloch-point, a
peculiar object implying the local vanishing of magnetization within a
ferromagnet. Its existence had been postulated and described theoretically
since several decades, however it has never been observed. We con rm
experimentally the existence of Bloch points, imaged within domain walls in
cylindrical magnetic nanowires, combining surface and transmission XMCD-PEEM
magnetic microscopy. This opens the way to the experimental search for peculiar
phenomena predicted during the motion of Bloch-point-based domain walls.

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The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con