Fig. 4: FMR mode with left-handed (LH) chirality and exchange mode with right-handed (RH) chirality.
a Normalized V/Papp signals at T = 30 K. The FMR mode is observed when H < Htwist, and the exchange mode is observed when H > Htwist. b The dispersion relations between f and Hres of the FMR mode and exchange mode at T = 30 K. The FMR mode is confirmed through fitting by the Kittel equation. The Hres dependence of f for the exchange mode is calculated by the micromagnetic simulation. c Normalized V/Papp signals (f = 16 GHz) at 20 K, 30 K and 40 K. FMR mode (exchange mode) is indicated by green (red) arrows. Gray dotted lines indicate the strength of Htwist. d The recurrent switching of the external field H can modulate (e) the chirality as well as the V(H) signal. The change of H (ΔH) for this modulation can be reduced by decreasing Htwist, as shown in the inset of d.
