Figure 2
Spin resonance data and comparison with theory. (a–d) Typical spectra Δ|S 12| in arbitrary units with the sample positioned differently on the CPW as sketched on top of each panel. Data are shown for different applied field values in the helical, conical, and SkL phase and are offset for clarity. The field is applied along the 〈100〉 direction. Symbols indicate resonance frequencies. (e–g) Comparison of measured and calculated resonance frequencies. Lines and shaded bands correspond to calculations with k = 0 and magnetostatic waves with small k ≠ 0, respectively22. Dashed lines indicate modes with small spectral weight. Circles highlight that a different number of modes is resolved at small H.
