Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunable gigahertz dynamics of low-temperature skyrmion lattice in a
  chiral magnet   Recently, it has been shown that the chiral magnetic insulator Cu$_2$OSeO$_3$
hosts skyrmions in two separated pockets in temperature and magnetic field
phase space. It has also been shown that the predominant stabilization
mechanism for the low-temperature skyrmion (LTS) phase is via the crystalline
anisotropy, opposed to temperature fluctuations that stabilize the
well-established high-temperature skyrmion (HTS) phase. Here, we report on a
detailed study of LTS generation by field cycling, probed by GHz spin dynamics
in Cu$_2$OSeO$_3$. LTSs are populated via a field cycling protocol with the
static magnetic field applied parallel to the $\langle{100}\rangle$ crystalline
direction of plate and cuboid-shaped bulk crystals. By analyzing
temperature-dependent broadband spectroscopy data, clear evidence of
low-temperature skyrmion excitations with clockwise (CW), counterclockwise
(CCW), and breathing mode (BR) character at temperatures below $T$ = 40 K are
shown. We find that the mode intensities can be tuned with the number of
field-cycles below the saturation field. By tracking the resonance frequencies,
we are able to map out the field-cycle-generated LTS phase diagram, from which
we conclude that the LTS phase is distinctly separated from the
high-temperature counterpart. We also study the mode hybridization between the
dark CW and the BR modes as a function of temperature. By using two
Cu$_2$OSeO$_3$ crystals with different shapes and therefore different
demagnetization factors, together with numerical calculations, we unambiguously
show that the magnetocrystalline anisotropy plays a central role for the mode
hybridization.

37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex