title: Exchange anisotropy in the skyrmion host GaV4S8.
abstract: Using ferromagnetic resonance spectroscopy at 34 GHz we explored the magnetic anisotropy of single-crystalline GaV4S8in the field-polarized magnetic state. We describe the data in terms of an easy-axis type uniaxial anisotropy with an anisotropy constant [Formula: see text] erg cm-3at 2 K, corresponding to a relative exchange anisotropy [Formula: see text]%, and about [Formula: see text]erg cm-3near 11 K, i.e. at temperatures where the skyrmion-lattice phase was recently discovered. The relatively large value of K1explains the confinement of the skyrmion tubes to the [Formula: see text] easy axes. A distinct set of resonances in the spectra is attributed to the co-existence of different rhombohedral domains. Complementary broadband spectroscopy demonstrates that non-collinear spin states may sensitively be detected by electron spin resonance techniques.
authors.affiliation: Experimentalphysik V, Zentrum für elektronische Korrelationen und Magnetismus, Universität Augsburg, 86135 Augsburg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Ehlers
authors.forename: I
authors.initials: I
authors.lastname: Stasinopoulos
authors.forename: I
authors.initials: I
authors.lastname: Kézsmárki
authors.forename: T
authors.initials: T
authors.lastname: Fehér
authors.forename: V
authors.initials: V
authors.lastname: Tsurkan
authors.forename: H-A Krug
authors.initials: HK
authors.lastname: von Nidda
authors.forename: D
authors.initials: D
authors.lastname: Grundler
authors.forename: A
authors.initials: A
authors.lastname: Loidl