Fig. 4. Differentiation between the static and dynamic magnetism.

a Time evolution of normalized muon spin polarization, $A_{\mathrm{LF}}^{\mathrm{N}}$, of the m = 1 superlattice at 5 K for various applied longitudinal magnetic fields. Error bars represent one standard deviation. The solid lines represent fit using a model given by Eq. (4). The significant decrease of asymmetry at high fields is a hallmark of dynamic magnetism. Panels b and c display the theoretical Gaussian Kubo-Toyabe functions used in the fit for dynamically fluctuating moments, P_dyn, and for static disordered moments, P_stat, respectively.