Barkhausen Noise from Precessional Domain Wall Motion

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http://hdl.handle.net/10138/308449

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Herranen , T & Laurson , L 2019 , ' Barkhausen Noise from Precessional Domain Wall Motion ' , Physical Review Letters , vol. 122 , no. 11 , 117205 . https://doi.org/10.1103/PhysRevLett.122.117205

Title: Barkhausen Noise from Precessional Domain Wall Motion
Author: Herranen, Touko; Laurson, Lasse
Contributor: University of Helsinki, Helsinki Institute of Physics
Date: 2019-03-21
Language: eng
Number of pages: 5
Belongs to series: Physical Review Letters
ISSN: 0031-9007
URI: http://hdl.handle.net/10138/308449
Abstract: The jerky dynamics of domain walls driven by applied magnetic fields in disordered ferromagnets-the Barkhausen effect-is a paradigmatic example of crackling noise. We study Barkhausen noise in disordered Pt/Co/Pt thin films due to precessional motion of domain walls using full micromagnetic simulations, allowing for a detailed description of the domain wall internal structure. In this regime the domain walls contain topological defects known as Bloch lines which repeatedly nucleate, propagate, and annihilate within the domain wall during the Barkhausen jumps. In addition to bursts of domain wall propagation, the in-plane Bloch line dynamics within the domain wall exhibits crackling noise and constitutes the majority of the overall spin rotation activity.
Subject: 114 Physical sciences
avalanches
dynamics
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