Effects of Disorder and Internal Dynamics on Vortex Wall Propagation

Abstract

Experimental measurements of domain wall propagation are typically interpreted by comparison to reduced models that ignore both the effects of disorder and the internal dynamics of the domain wall structure. Using micromagnetic simulations, we study vortex wall propagation in magnetic nanowires induced by fields or currents in the presence of disorder. We show that the disorder leads to increases and decreases in the domain wall velocity depending on the conditions. These results can be understood in terms of an effective damping that increases as disorder increases. As a domain wall moves through disorder, internal degrees of freedom get excited, increasing the energy dissipation rate.

4 pages, 5 figures

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• Low magnetic damping of ferrimagnetic GdFeCo alloys
• Few-nm tracking of magnetic vortex orbits and their decay with ultrafast Lorentz microscopy
• Magnetic domain walls displacement : automotion vs. spin-transfer torque
• Minimization of Ohmic losses for domain wall motion in a ferromagnetic nanowire
• Domain walls within domain walls in wide ferromagnetic strips
• Influence of material defects on current-driven vortex domain wall mobility
• Dzyaloshinskii-Moriya domain walls in magnetic nanotubes
• The effect of disorder on transverse domain wall dynamics in magnetic nanostrips
• Domain-wall dynamics in translationally noninvariant nanowires: theory and applications
• Effective Field Model of Roughness in Magnetic Structures
• Magneto-Optical Imaging of Vortex Domain Deformation in Pinning Sites
• Mapping the domain wall pinning landscape in ferromagnetic films
• Effects of disorder on magnetic vortex gyration
• Barkhausen noise from formation of 360${}^{\circ }$ domain walls in disordered permalloy thin films
• Revealing nanoscale disorder in W/CoFeB/MgO ultra-thin films using domain wall motion
• Coarsening dynamics of topological defects in thin Permalloy films
• Fast vortex wall motion in wide Permalloy strips from double switching of the vortex core
• Domain-wall complexes in ferromagnetic stripes
• Realizing an Isotropically Coercive Magnetic Layer for Memristive Applications by Analogy to Dry Friction
• Electrically controlled pinning of Dzyaloshinskii-Moriya domain walls
• Externally-driven transformations of vortex textures in flat submicrometer magnets
• Topologically Protected Dynamics of Spin Textures