Model for domain wall avalanches in ferromagnetic thin films

Abstract

The Barkhausen jumps or avalanches in magnetic domain-walls motion between succesive pinned configurations, due the competition among magnetic external driving force and substrum quenched disorder, appear in bulk materials and thin films. We introduce a model based in rules for the domain wall evolution of ferromagnetic media with exchange or short-range interactions, that include disorder and driving force effects. We simulate in 2-dimensions with Monte Carlo dynamics, calculate numerically distributions of sizes and durations of the jumps and find power-law critical behavior. The avalanche-size exponent is in excellent agreement with experimental results for thin films and is close to predictions of the other models, such as like random-field and random-bond disorder, or functional renormalization group. The model allows us to review current issues in the study of avalanches motion of the magnetic domain walls in thin films with ferromagnetic interactions and opens a new approach to describe these materials with dipolar or long-range interactions.

12 pages, 3 figures, This version includes revisions

References in corpus (7)

• Beyond power laws: Universality in the average avalanche shape
• Crackling dynamics in material failure as the signature of a self-organized dynamic phase transition
• Exactly solvable model of avalanches dynamics for Barkhausen crackling noise
• Avalanche-size distribution at the depinning transition: A numerical test of the theory
• Width distribution of contact lines on a disordered substrate
• The mechanisms of spatial and temporal earthquake clustering
• Effect of dipolar interactions for domain wall dynamics in magnetic thin films

Cited by in corpus (5)

• Diffusion in mesoscopic lattice models of amorphous plasticity
• Statistical properties of Barkhausen noise in amorphous ferromagnetic films
• Intrinsic anomalous scaling in a ferromagnetic thin film model
• Scaling properties of a ferromagnetic thin film model at the depinning transition
• Stochastic model for the CheY-P molarity in the neighbourhood of E. coli flagella motors