Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic domain walls in nanostrips of single-crystalline
  $\mathrm{Fe}_4\mathrm{N}(001)$ thin films with fourfold in-plane magnetic
  anisotropy   We investigated head-to-head domain walls in nanostrips of epitaxial
$\mathrm{Fe}_4\mathrm{N}(001)$ thin films, displaying a fourfold magnetic
anisotropy. Magnetic force microscopy and micromagnetic simulations show that
the domain walls have specific properties, compared to soft magnetic materials.
In particular, strips aligned along a hard axis of magnetization are wrapped by
partial flux-closure concertina domains below a critical width, while
progressively transforming to zigzag walls for wider strips. Transverse walls
are favored upon initial application of a magnetic field transverse to the
strip, while transformation to a vortex walls is favored upon motion under a
longitudinal magnetic field. In all cases the magnetization texture of such
fourfold anisotropy domain walls exhibits narrow micro-domain walls, which may
give rise to peculiar spin-transfer features.

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The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex