Please use this identifier to cite or link to this item: https://repositorio.ufrn.br/handle/123456789/45025
Title: Statistical properties of Barkhausen noise in amorphous ferromagnetic films
Authors: Bohn, Felipe
Corrêa, Marcio Assolin
Carara, M.
Papanikolaou, Stefanos
Durin, G.
Sommer, Rubem Luis
Keywords: Ruído de Barkhausen;Filmes ferromagnéticos amorfos;Barkhausen noise;Amorphous ferromagnetic films
Issue Date: 29-Sep-2014
Publisher: American Physical Society
Citation: BOHN, Felipe; CORRÊA, Marcio Assolin.; CARARA, M.; PAPANIKOLAOU, Stefanos.; DURIN, G.; SOMMER, Rubem Luis. Statistical properties of Barkhausen noise in amorphous ferromagnetic films. Physical Review e, [s.l.], v. 90, n. 3, p. 032821/1-032821/9, 29 set. 2014. American Physical Society (APS). Disponível em: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.90.032821. Acesso em: 24 mai. 2020. DOI: http://dx.doi.org/10.1103/physreve.90.032821.
Portuguese Abstract: We investigate the statistical properties of the Barkhausen noise in amorphous ferromagnetic films with thicknesses in the range between 100 and 1000 nm. From Barkhausen noise time series measured with the traditional inductive technique, we perform a wide statistical analysis and establish the scaling exponents τ , α, 1/σ νz, and ϑ. We also focus on the average shape of the avalanches, which gives further indications on the domain-wall dynamics. Based on experimental results, we group the amorphous films in a single universality class, characterized by scaling exponents τ = 1.28 ± 0.02, α = 1.52 ± 0.3, and 1/σ νz = ϑ = 1.83 ± 0.03, values compatible with that obtained for several bulk amorphous magnetic materials. Besides, we verify that the avalanche shape depends on the universality class. By considering the theoretical models for the dynamics of a ferromagnetic domain wall driven by an external magnetic field through a disordered medium found in literature, we interpret the results and identify an experimental evidence that these amorphous films, within this thickness range, present a typical three-dimensional magnetic behavior with predominant short-range elastic interactions governing the domain-wall dynamics. Moreover, we provide experimental support for the validity of a general scaling form for the average avalanche shape for non-mean-field systems
Abstract: We investigate the statistical properties of the Barkhausen noise in amorphous ferromagnetic films with thicknesses in the range between 100 and 1000 nm. From Barkhausen noise time series measured with the traditional inductive technique, we perform a wide statistical analysis and establish the scaling exponents τ , α, 1/σ νz, and ϑ. We also focus on the average shape of the avalanches, which gives further indications on the domain-wall dynamics. Based on experimental results, we group the amorphous films in a single universality class, characterized by scaling exponents τ = 1.28 ± 0.02, α = 1.52 ± 0.3, and 1/σ νz = ϑ = 1.83 ± 0.03, values compatible with that obtained for several bulk amorphous magnetic materials. Besides, we verify that the avalanche shape depends on the universality class. By considering the theoretical models for the dynamics of a ferromagnetic domain wall driven by an external magnetic field through a disordered medium found in literature, we interpret the results and identify an experimental evidence that these amorphous films, within this thickness range, present a typical three-dimensional magnetic behavior with predominant short-range elastic interactions governing the domain-wall dynamics. Moreover, we provide experimental support for the validity of a general scaling form for the average avalanche shape for non-mean-field systems
URI: https://repositorio.ufrn.br/handle/123456789/45025
ISSN: 2470-0053
2470-0045
Appears in Collections:CCET - DFTE - Artigos publicados em periódicos

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