Fig. 4: The switching of the polarity of a meron induced by an in-plane magnetic field pulse.
a The out-of-plane component of the reduced magnetization mz as a function of time. The initial state is a meron (p = 1) relaxed in the disk with 13 spins in the diameter (i.e., the radius of the meron is n = 7). The in-plane magnetic field of Hx = 400 mT is applied for 60 ps (indicated by the cyan area), followed by the relaxation until t = 1000 ps. The meron is switched to the state with p = −1 after the application of the in-plane field. b The in-plane components of the reduced magnetization mx and my as functions of time. c Selected top-view snapshots showing the spin configuration in the nanodisk during the field-induced switching of the meron polarity. The simulation parameters are given in the caption of Fig. 2. More details are given in the “Methods” section.
