Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interfacial Dzyaloshinskii-Moriya interaction in
  perpendicularly-magnetized Pt/Co/AlO$_x$ ultrathin films measured by
  Brillouin light spectroscopy   Spin waves in perpendicularly-magnetized Pt/Co/AlO$_x$/Pt ultrathin films
with varying Co thicknesses (0.6-1.2 nm) have been studied with Brillouin light
spectroscopy in the Damon-Eshbach geometry. The measurements reveal a
pronounced nonreciprocal propagation, which increases with decreasing Co
thicknesses. This nonreciprocity is attributed to an interfacial
Dzyaloshinskii-Moriya interaction (DMI), which is significantly stronger than
asymmetries resulting from surface anisotropies for such modes. Results are
consistent with an interfacial DMI constant $D_s = -1.7 \pm 0.11$ pJ/m, which
favors left-handed chiral spin structures. This suggests that such films below
1 nm in thickness should support novel chiral states like skyrmions.

26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex