Role of impurity clusters for the current-driven motion of magnetic Skyrmions

Abstract

We study how impurities influence the current-induced dynamics of magnetic Skyrmions moving in a racetrack geometry. For this, we solve numerically the generalized Landau-Lifshitz-Gilbert equation extended by the current-induced spin transfer torque. In particular, we investigate two classes of impurities, non-conducting and magnetic impurities. The former are magnetically rigid objects and yield to an inhomogeneous current density over the racetrack which we determine separately by solving the fundamental electrostatic equations. In contrast, magnetic impurities leave the applied current density homogeneous throughout the stripe. Depending on parameters, we observe four different scenarios of Skyrmion motions in the presence of disorder, the Skyrmion decay, the pinning, the creation of additional Skyrmions, and ordinary Skyrmion passage. We calculate and discuss phase diagrams in dependence of the impurity concentration and radii of the impurities.

References in corpus (2)

• Skyrmion Hall Effect Revealed by Direct Time-Resolved X-Ray Microscopy
• Theory of current-driven motion of Skyrmions and spirals in helical magnets

Cited by in corpus (8)

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• Moving skyrmions in Antiferromagnets by Sublattice Displacements
• Skyrmion bound state and dynamics in an antiferromagnetic bilayer racetrack
• Spin Wave Driven Skyrmions in a Bipartite Antiferromagnetic Lattice
• Microscopic theory of current-induced skyrmion transport and its application in disordered spin textures