Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Doping of Mn$_2$VAl and Mn$_2$VSi Heusler alloys as a route to
  half-metallic antiferromagnetism   Half-metallic antiferromagnets are the ideal materials for spintronic
applications since their zero magnetization leads to lower stray fields and
thus tiny energy losses. Starting from the Mn$_2$VAl and Mn$_2$VSi alloys we
substitute Co or Fe for Mn and we show by means of first-principle electronic
structure calculations that the resulting compounds are ferrimagnets. When the
total number of valence electrons reaches the magic number of 24 the Fe-doped
compounds are semi-metals and thus non-magnetic while the Co-doped ones show
the desirable half-metallic antiferromagnetic character. The compounds are very
likely to be synthesized experimentally since the parent compounds, Mn$_2$VAl
and Co$_2$VAl, have been already grown in the Heusler $L2_1$ lattice structure.

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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs