Topologically protected dynamics of spin textures

We study current-induced dynamics of spin textures in thin magnetic nanowires. We derive effective equations of motion describing the dynamics of the domain-wall soft modes associated with topological defects. Because the magnetic domain walls are topological objects, these equations are universal and depend only on a few parameters. We obtain spin spiral domain-wall structure in ferromagnetic wires with Dzyaloshinskii–Moriya interaction and critical current dependence on this interaction. We also find the most efficient way to move the domain walls by resonant current pulses and propose a procedure to determine their dynamics by measuring the voltage induced by a moving domain wall. Based on translationally non-invariant nanowires, we show how to make prospective magnetic memory nanodevices much more energy efficient. - Highlights: • We study the current induced dynamics of spin textures in thin magnetic nanowires. • The universal equations of motion for the domain wall (DW) dynamics are derived. • We find the most efficient way to move the domain walls by resonant current pulses. • The parameters of the DW dynamics can be determined by electric measurements. • We propose a prospective energy-efficient magnetic memory nanodevice