The amplitude ratio (a) and phase shift (b) of spin wave along the domain wall for different wave numbers. The solid lines correspond to the case of α = 0.01, and the dashed lines to α = 0. The insets show the total amplitude ratio and phase shift across the domain wall. The rest parameters are the same as those in Fig. 2. Thus, the domain width Δ=1/κ−d2=2.53 in dimensionless form or 1.74 × 10^{– 8} m after restoring the dimension.