Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Micromagnetic description of twisted spin spirals in the B20 chiral
  magnet FeGe from first principles   Using the model of classical Heisenberg exchange and Dzyaloshinskii-Moriya
(DM) interaction we show that the ground state of B20 FeGe chiral magnet is a
superposition of twisted helical spin-density waves formed by different
sublattices of the crystal. Such twisted spin-density waves propagate in the
same direction but with different phases and different directions of the
rotation axes. We derive an advanced micromagnetic expression describing the
exchange and DM interaction for such magnetic structures. By employing
first-principles calculations based on density functional theory and using our
micromagnetic model we show that the magnitude of the spin-spiral twist in B20
FeGe is of the same order as global spiraling. While the energy difference
between the ground state of twisted spirals and the FM state is in good
agreement with the experimental results, for the spin spirals without a twist
it is smaller by factor three. In addition, we verify our results by employing
spin dynamics simulations. This calls for new experiments exploring the ground
state properties of B20 chiral magnets.

28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin