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  • Letter
  • Open Access

Barkhausen noise from formation of 360∘ domain walls in disordered permalloy thin films

Sami Kaappa and Lasse Laurson

  • Computational Physics Laboratory, Tampere University, P.O. Box 692, FI-33014 Tampere, Finland

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Phys. Rev. Research 5, L022006 – Published 6 April, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L022006

Abstract

Barkhausen noise in disordered ferromagnets is typically understood to originate primarily from jerky field-driven motion of domain walls. We study the magnetization reversal process in disordered permalloy thin films using micromagnetic simulations and find that the magnetization reversal process consists of gradual formation of immobile 360∘ domain walls via a sequence of localized magnetization rotation events. The density of 360∘ domain walls formed within the sample as well as the statistical properties of the Barkhausen jumps are controlled by the disorder strength.

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Phys. Rev. Research 5, L022006– Published 6 April, 2023
  • Received 23 June 2022
  • Revised 28 February 2023
  • Accepted 2 March 2023
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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