Creep turns linear in narrow ferromagnetic nanostrips

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Leliaert , J , Van de Wiele , B , Vansteenkiste , A , Laurson , L , Durin , G , Dupre , L & Van Waeyenberge , B 2016 , ' Creep turns linear in narrow ferromagnetic nanostrips ' Scientific Reports , vol. 6 , 20472 . DOI: 10.1038/srep20472

Title: Creep turns linear in narrow ferromagnetic nanostrips
Author: Leliaert, Jonathan; Van de Wiele, Ben; Vansteenkiste, Arne; Laurson, Lasse; Durin, Gianfranco; Dupre, Luc; Van Waeyenberge, Bartel
Contributor: University of Helsinki, Helsinki Institute of Physics
Date: 2016-02-04
Language: eng
Number of pages: 9
Belongs to series: Scientific Reports
ISSN: 2045-2322
URI: http://hdl.handle.net/10138/174904
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.
Subject: DOMAIN-WALL DYNAMICS
PERPENDICULAR ANISOTROPY
MOTION
MEMORY
UNIVERSALITY
FLUCTUATIONS
TEMPERATURE
RACETRACK
NANOWIRES
STRIPS
114 Physical sciences
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