Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First-principles investigation of the effect of substitution and surface
  adsorption on magnetostrictive properties of Fe-Ga alloys   Materials with large magnetostriction are widely used in sensors, actuators,
micro electromechanical systems, and energy-harvesters. Binary Fe-Ga alloys
(Galfenol) are the most promising rare-earth-free candidates combining numerous
advantages such as low saturation magnetic field (~200 Oe), excellent ductility
and low cost, while further improving their performance is imperative for
practical applications. Using density functional theory calculation, we report
results of the effect of substituting small amount of additional elements X
(eg. X = Ag, Pd and Cu) on magnetostriction of Fe-Ga alloys, and find that it
may double the magnetostriction with a substitutional percentage of only 1.6%.
Moreover, adsorbents with high chemical activity (eg. O or Os atoms) may affect
the surface energy of different face-orientations of Fe-Ga alloys, indicating
proper surface treatments are necessary to tune the alignment of Fe-Ga grains
to achieve better performance. These results may be helpful to further optimize
the magnetostrictive properties of Fe-Ga alloys for device applications.

30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int