Barkhausen noise in soft amorphous magnetic materials under applied stress

TL;DR

This study investigates how tensile stress affects Barkhausen noise in amorphous magnetic alloys, revealing stress-induced changes in domain wall dynamics and a different universality class characterized by specific scaling exponents.

Contribution

It provides experimental evidence that stress-induced anisotropy alters the universality class of Barkhausen noise in amorphous magnetic materials, highlighting the role of short-range elastic interactions.

Findings

Stress enhances short-range elastic interactions over dipolar interactions.

The universality class differs from typical Barkhausen noise measurements.

Scaling exponents are  = 1.3 and  = 1.5 for jump size and duration distributions.

Abstract

We report experimental measurements of Barkhausen noise on Fe_{64}Co_{21}B_{15} amorphous alloy under tensile stress. We interpret the scaling behavior of the noise distributions in terms of the depinning transition of the domain walls. We show that stress induced anisotropy enhance the effect of short-range elastic interactions that dominate over long-range dipolar interactions. The universality class is thus different from the one usually observed in Barkhausen noise measurements and is characterized by the exponents \tau = 1.3 and \alpha = 1.5, for the decay of the distributions of jump sizes and durations.