Playing with universality classes of Barkhausen avalanches

Abstract

Many systems crackle, from earthquakes and financial market to Barkhausen effect in ferromagnetic materials. Despite the diversity in essence, the noise emitted in these dynamical systems consists of avalanche-like events with broad range of sizes and durations, characterized by power-law avalanche distributions and typical average avalanche shape that are signatures dependent on the universality class of the underlying dynamics. Here we focus on the crackling noise in ferromagnets and scrutinize the traditional statistics of Barkhausen avalanches in polycrystalline and amorphous ferromagnetic films having different thicknesses. We show how scaling exponents and average shape of the avalanches evolve with the structural character of the materials and film thickness. We find quantitative agreement between experiment and theoretical predictions of models for the magnetic domain wall dynamics, and then elucidate the universality classes of Barkhausen avalanches in ferromagnetic films. Thereby, we observe for the first time the dimensional crossover in the domain wall dynamics, and the outcomes of the interplay between system dimensionality and range of interactions governing the domain wall dynamics on Barkhausen avalanches.

6 figures, 2 tables

References in corpus (4)

• Exactly solvable model of avalanches dynamics for Barkhausen crackling noise
• Quantitative scaling of magnetic avalanches
• Universality and the collapse of multifractality in Barkhausen avalanches
• Barkhausen noise from zigzag domain walls

Cited by in corpus (7)

• Studies of Barkhausen Pulses in Ferroelectrics
• Universal Excursion and Bridge shapes in ABBM/CIR/Bessel processes
• Magnetic domain dynamics in an insulating quantum ferromagnet
• Effect of the Uniform Random External Magnetic Field with Spatio-temporal Variation on Compensation in Ising Spin-1/2 Trilayered Square Ferrimagnet
• The effects of external noise on threshold induced correlations in ferromagnetic systems
• The critical Barkhausen avalanches in thin random-field ferromagnets with an open boundary
• The Serrated-Flow Behavior in High-Entropy Alloys