Skyrmion dynamics under uniaxial anisotropy
Physical review. B./Physical review. B2016Vol. 94(1)
Citations Over TimeTop 10% of 2016 papers
D. Ehlers, Ioannis Stasinopoulos, V. Tsurkan, H.‐A. Krug von Nidda, T. Fehér, A. A. Leonov, I. Kézsmárki, Dirk Grundler, A. Loidl
Abstract
Broadband microwave spectroscopy has been performed on single-crystalline ${\mathrm{GaV}}_{4}{\mathrm{S}}_{8}$, which exhibits a complex magnetic phase diagram including cycloidal and N\'eel-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 N\'eel skyrmions by the hard-axis orientation of relevant spins.