Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First Principles Calculation of Magnetocrystalline Anisotropy Energy of
  MnBi and MnB_{1-x}Sn_x   We calculated the magnetic anisotropy constant Ku of MnBi using a first
principles approach, and obtained a negative Ku in agreeable with experimental
results. Furthermore, we also found a band filling dependence indicating that a
slight decrease in the valence electron number will change Ku from negative to
positive. When some of the Bi is replaced with Sn to decrease the valence
electron number, the Ku value of MnBi1-xSnx drastically changes to a positive
value, Ku~2 MJ/m3, for x > 0.05.

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The categories of this paper are: comp-gas
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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: econ
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph