Fig. 3: Asymmetry parameter χ of ACMs extracted from BLS spectra taken at ± 250 mT.
From: Geometry-induced spin chirality in a non-chiral ferromagnet at zero field
a–d, BLS spectra measured as a function of position across the spiral (see definition of z in Fig. 2a) along a RH ACM in a field of +250 mT (a) and −250 mT (c), and along a LH ACM in a field of +250 mT (b) and −250 mT (d). The red/blue boxes indicated how we allocate signals to wavevectors of magnons, consistent with the colours in Fig. 2b. e, Magnon spectra obtained on a RH ACM (pink symbols) and a LH ACM (green symbols) in a field µ0H = +250 mT at position z = −0.5 µm. Curves reflect Lorentzian fits. f, Quantitative analysis of the frequency non-reciprocity parameter χ for a RH ACM (pink) and a LH ACM (green) as a function of position z.
