Barkhausen noise from precessional domain wall motion

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.

arXiv comment5 pages, 5 figures

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• Tuning Ginzburg-Landau theory to quantitatively study thin ferromagnetic materials
• Degradation of domains with sequential field application
• Magnetic domain dynamics in an insulating quantum ferromagnet
• Critical properties of deterministic and stochastic sandpile models on two-dimensional percolation backbone
• Bursty magnetic friction between polycrystalline thin films with domain walls