Topologically Protected Dynamics of Spin Textures

Abstract

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.

13 pages, 4 figures, Invited MISM-2014 conference proceeding for special issue in JMMM

References in corpus (13)

• Theory of current-driven motion of Skyrmions and spirals in helical magnets
• Dynamics of domain walls in magnetic nanostrips
• Phenomenology of Current-Induced Dynamics in Antiferromagnets
• Staggered Dynamics in Antiferromagnets by Collective Coordinates
• Electron Transport Driven by Nonequilibrium Magnetic Textures
• Dynamics of a vortex domain wall in a magnetic nanostrip: an application of the collective coordinate approach
• Thermally-Assisted Current-Driven Domain Wall Motion
• Effects of Disorder and Internal Dynamics on Vortex Wall Propagation
• Minimization of Ohmic losses for domain wall motion in a ferromagnetic nanowire
• Effects of non-adiabaticity on the voltage generated by a moving domain wall
• Domain-wall dynamics in translationally noninvariant nanowires: theory and applications
• Optimal time-dependent polarized current pattern for fast domain wall propagation in nanowires: Exact solutions for biaxial and uniaxial anisotropies
• Power optimization for domain wall motion in ferromagnetic nanowires