Please use this identifier to cite or link to this item: https://repositorio.ufrn.br/handle/123456789/45025
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dc.contributor.authorBohn, Felipe-
dc.contributor.authorCorrêa, Marcio Assolin-
dc.contributor.authorCarara, M.-
dc.contributor.authorPapanikolaou, Stefanos-
dc.contributor.authorDurin, G.-
dc.contributor.authorSommer, Rubem Luis-
dc.date.accessioned2021-11-25T15:28:02Z-
dc.date.available2021-11-25T15:28:02Z-
dc.date.issued2014-09-29-
dc.identifier.citationBOHN, 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.pt_BR
dc.identifier.issn2470-0053-
dc.identifier.issn2470-0045-
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/45025-
dc.description.abstractWe 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 systemspt_BR
dc.languageenpt_BR
dc.publisherAmerican Physical Societypt_BR
dc.subjectRuído de Barkhausenpt_BR
dc.subjectFilmes ferromagnéticos amorfospt_BR
dc.subjectBarkhausen noisept_BR
dc.subjectAmorphous ferromagnetic filmspt_BR
dc.titleStatistical properties of Barkhausen noise in amorphous ferromagnetic filmspt_BR
dc.typearticlept_BR
dc.description.resumoWe 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 systemspt_BR
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