Ehlers, D.Stasinopoulos, I.Tsurkan, V.Von Nidda, H. -A. KrugFeher, T.Leonov, A.Kezsmarki, I.Grundler, D.Loidl, A.2016-10-182016-10-182016-10-18201610.1103/PhysRevB.94.014406https://infoscience.epfl.ch/handle/20.500.14299/129839WOS:000379700000004Broadband microwave spectroscopy has been performed on single-crystalline GaV4S8, which exhibits a complex magnetic phase diagram including cycloidal and Neel-type skyrmion lattice phases below 13 K. At small magnetic fields two collective modes with large frequency separation are found that reflect the cycloid state subject to a large uniaxial anisotropy. In the skyrmion lattice phase three modes are resolved. Analyzing the spin-precessional motion microscopically, we explain the low frequency of the breathing mode in these Neel skyrmions by the hard-axis orientation of relevant spins.skyrmionmagnonmagnonicsspin waveferromagnetic resonancetext::journal::journal article::research article