Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Searching the weakest link: Demagnetizing fields and magnetization
  reversal in permanent magnets   Magnetization reversal in permanent magnets occurs by the nucleation and
expansion of reversed domains. Micromagnetic theory offers the possibility to
localize the spots within the complex structure of the magnet where
magnetization reversal starts. We compute maps of the local nucleation field in
a Nd2Fe14B permanent magnet using a model order reduction approach. Considering
thermal fluctuations in numerical micromagnetics we can also quantify the
reduction of the coercive field due to thermal activation. However, the major
reduction of the coercive field is caused by the soft magnetic grain boundary
phases and misorientation if there is no surface damage.

33
The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
7
The categories of this paper are: hep-th
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The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
16
The categories of this paper are: stat
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci