Universal properties of magnetization dynamics in polycrystalline ferromagnetic films

Abstract

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\sim 1.5, α\sim 2.0, and 1/σνz \sim \vartheta \sim 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.

8 pages, 7 figures

References in corpus (2)

• Exactly solvable model of avalanches dynamics for Barkhausen crackling noise
• Barkhausen noise from zigzag domain walls

Cited by in corpus (5)

• Quantitative scaling of magnetic avalanches
• Playing with universality classes of Barkhausen avalanches
• Universality and the collapse of multifractality in Barkhausen avalanches
• Statistical properties of Barkhausen noise in amorphous ferromagnetic films
• Scaling properties of a ferromagnetic thin film model at the depinning transition