Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Excitations in the Multiferroic N\'eel-type Skyrmion Host
  GaV$_4$S$_8$   Broadband microwave spectroscopy has been performed on single-crystalline
GaV$_4$S$_8$, which exhibits a complex magnetic phase diagram including
cycloidal, N\'eel-type skyrmion lattice, as well as field-polarized
ferromagnetic phases below 13 K. At zero and small magnetic fields two
collective modes are found at 5 and 15 GHz, which are characteristic of the
cycloidal state in this easy-axis magnet. In finite fields, entering the
skyrmion lattice phase, the spectrum transforms into a multi-mode pattern with
absorption peaks near 4, 8, and 15 GHz. The spin excitation spectra in
GaV$_4$S$_8$ and their field dependencies are found to be in close relation to
those observed in materials with Bloch-type skyrmions. Distinct differences
arise from the strong uniaxial magnetic anisotropy of GaV4S8 not present in
so-far known skyrmion hosts.

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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: math