2013/07/03 by Felipe Bohn, Marcio Assolin Correa, Alexandre Da Cas Viegas +3 · 1 citation
Physics and Astronomy · #cond-mat.mtrl-sci #cond-mat.dis-nn #cond-mat.stat-mech
paper · pdf · doi:10.1103/physreve.88.032811
published as Phys. Rev. E 88, 032811 (2013) · 8 pages, 7 figures
arxiv created 2013/07/03 · arxiv updated 2013/10/09
We investigate the scaling behavior in the statistical properties of Barkhausen noise in ferromagnetic films. We apply the statistical treatment usually employed for bulk materials in experimental Barkhausen noise time series measured with the traditional inductive technique in polycrystalline ferromagnetic films having different thickness from 100 up to 1000 nm, and investigate the scaling exponents. Based on this procedure, we can group the samples in a single universality class, characterized by exponents τ∼ 1.5, α∼ 2.0, and 1/σνz ∼ ϑ ∼ 2.0. We interpret these results in terms of theoretical models and provide experimental evidence that a well-known mean-field model for the dynamics of a ferromagnetic domain wall in three-dimensional ferromagnets can be extended for films. We identify that the films present an universal three-dimensional magnetization dynamics, governed by long-range dipolar interactions, even at the smallest thicknesses, indicating that the two-dimensional magnetic behavior commonly verified for films cannot be generalized for all thickness ranges.