Fig. 5: Deformation of the moving domain wall and Walker breakdown.
From: Structure, control, and dynamics of altermagnetic textures
Snapshots of the static (a) and moving (b) domain wall. The motion induces canting of the sublattice magnetizations in the domain wall center (magenta spheres) due to the difference in intrasublattice stiffnesses. The canting creates intersublattice exchange torques that further rotate the magnetic moments out of the domain wall plane. The right panels show the spatial trajectories of the sublattice magnetizations in the static and moving domain wall. c Frequency Ω of oscillations between Bloch and Néel type for the steady-moving domain wall versus velocity, calculated for two values of AAS γAaniMs: 0.97 (red) and 0.2 (blue) rad ⋅ nm2/ps. The insets show the velocity dependence of the motion-induced component δnout/Ms. The moving domain wall loses stability when δnout = Ms (Walker breakdown), as shown by the arrow line. Symbols are the results of spin-lattice model simulations and solid lines are calculated from the analytical phenomenological model (see Section III of Supplementary Materials). For calculations we use xdw = 4 nm, the limiting magnon velocity in nodal directions is c = 35 km/s.
