Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A micromagnetic theory of skyrmion lifetime in ultrathin ferromagnetic
  films   We use the continuum micromagnetic framework to derive the formulas for
compact skyrmion lifetime due to thermal noise in ultrathin ferromagnetic films
with relatively weak interfacial Dzyaloshinskii-Moriya interaction. In the
absence of a saddle point connecting the skyrmion solution to the ferromagnetic
state, we interpret the skyrmion collapse event as ``capture by an absorber''
at microscale. This yields an explicit Arrhenius collapse rate with both the
barrier height and the prefactor as functions of all the material parameters,
as well as the dynamical paths to collapse.

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The categories of this paper are: math
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
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The categories of this paper are: physics
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
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The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg