Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ab initio study of magnetocrystalline anisotropy, magnetostriction, and
  Fermi surface of L10 FeNi (tetrataenite)   The ordered L1$_0$ FeNi phase (tetrataenite) is recently considered as a
promising candidate for the rare-earth free permanent magnets applications. In
this work we calculate several characteristics of the L1$_0$ FeNi, where most
of the results come form the fully relativistic full potential FPLO method with
the generalized gradient approximation (GGA). A special attention deserves the
summary of the magnetocrystalline anisotropy energies (MAE's), the full
potential calculations of the anisotropy constant $K_3$, and the combined
analysis of the Fermi surface and three-dimensional $\mathbf{k}$-resolved MAE.
Other calculated parameters presented in this article are the magnetic moments
$m_{s}$ and $m_{l}$, magnetostrictive coefficient $\lambda_{001}$, bulk modulus
B$_0$, and lattice parameters. The MAE's summary shows rather big discrepancies
between the experimental MAE's from literature and also between the calculated
MAE's.

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The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
18
The categories of this paper are: econ
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an