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

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http://hdl.handle.net/10138/308092

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Estevez , V & Laurson , L 2017 , ' Fast vortex wall motion in wide permalloy strips from double switching of the vortex core ' , Physical Review B , vol. 96 , no. 6 , 064420 . https://doi.org/10.1103/PhysRevB.96.064420

Title: Fast vortex wall motion in wide permalloy strips from double switching of the vortex core
Author: Estevez, Virginia; Laurson, Lasse
Contributor organization: Helsinki Institute of Physics
Date: 2017-08-16
Language: eng
Number of pages: 11
Belongs to series: Physical Review B
ISSN: 2469-9950
DOI: https://doi.org/10.1103/PhysRevB.96.064420
URI: http://hdl.handle.net/10138/308092
Abstract: We study vortex domain wall dynamics in wide permalloy strips driven by applied magnetic fields and spin-polarized electric currents. As recently reported [V. Estevez and L. Laurson, Phys. Rev. B 93, 064403 (2016)], for sufficiently wide strips and above a threshold field, periodic dynamics of the vortex core are localized in the vicinity of one of the strip edges, and the velocity drop typically observed for narrow strips is replaced by a high-velocity plateau. Here, we analyze this behavior in more detail by means of micromagnetic simulations. We show that the high-velocity plateau originates from a repeated double switching of the magnetic vortex core, underlying the periodic vortex core dynamics in the vicinity of the strip edge, i.e., the "attraction-repulsion" effect. We also discuss the corresponding dynamics driven by spin-polarized currents, as well as the effect of including quenched random structural disorder to the system.
Subject: SPIN-POLARIZED CURRENT
PHASE-DIAGRAM
DOMAIN-WALLS
NANOWIRES
PROPAGATION
DYNAMICS
FIELD
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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