Creep turns linear in narrow ferromagnetic nanostrips

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Jonathan Leliaert
  • Ben Van de Wiele
  • Arne Vansteenkiste
  • Lasse Laurson

  • Gianfranco Durin
  • Luc Dupre
  • Bartel Van Waeyenberge

Research units

  • Ghent University
  • ISI Fdn

Abstract

The motion of domain walls in magnetic materials is a typical example of a creep process, usually characterised by a stretched exponential velocity-force relation. By performing large-scale micromagnetic simulations, and analyzing an extended 1D model which takes the effects of finite temperatures and material defects into account, we show that this creep scaling law breaks down in sufficiently narrow ferromagnetic strips. Our analysis of current-driven transverse domain wall motion in disordered Permalloy nanostrips reveals instead a creep regime with a linear dependence of the domain wall velocity on the applied field or current density. This originates from the essentially point-like nature of domain walls moving in narrow, line-like disordered nanostrips. An analogous linear relation is found also by analyzing existing experimental data on field-driven domain wall motion in perpendicularly magnetised media.

Details

Original languageEnglish
Article number20472
Number of pages9
JournalScientific Reports
Volume6
Publication statusPublished - 4 Feb 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • DOMAIN-WALL DYNAMICS, PERPENDICULAR ANISOTROPY, MOTION, MEMORY, UNIVERSALITY, FLUCTUATIONS, TEMPERATURE, RACETRACK, NANOWIRES, STRIPS

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