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We study vortex domain wall dynamics in wide Permalloy strips driven byapplied magnetic fields and spin-polarized electric currents. As recentlyreported [V. Est\'evez and L. Laurson, Phys. Rev. B, 93, 064403 (2016)], forsufficiently wide strips and above a threshold field, periodic dynamics of thevortex core are localized in the vicinity of one of the strip edges, and thevelocity drop typically observed for narrow strips is replaced by ahigh-velocity plateau. Here, we analyze this behavior in more detail by meansof micromagnetic simulations. We show that the high-velocity plateau originatesfrom a repeated double switching of the magnetic vortex core, underlying theperiodic vortex core dynamics in the vicinity of the strip edge, i.e., the"attraction-repulsion" effect. We also discuss the corresponding dynamicsdriven by spin-polarized currents, as well as the effect of including quenchedrandom structural disorder to the system.

Fast vortex wall motion in wide Permalloy strips from double switching of the vortex core