Shape of a Barkhausen pulse

TL;DR

This paper analyzes the shape of Barkhausen noise pulses, deriving a theoretical model based on domain wall motion in a Brownian potential and comparing it with experimental data from FeSi materials.

Contribution

It introduces a theoretical framework for the pulse shape of Barkhausen noise using a random process in a specific potential and validates it with experimental measurements.

Findings

Theoretical pulse shape matches experimental data.

Pulse shape relates to properties of a random process in a logarithmic-linear potential.

Model provides a new way to compare Barkhausen noise models and experiments.

Abstract

The average shape of the pulse in Barkhausen noise has been recently proposed as a tool to compare models and experiments. We compute theoretically the pulse shape of Barkhausen noise in a model describing the motion of a domain wall in an effective Brownian potential. In this framework, the pulse shape is related to the properties of the excursion of a random process in a $c\log(x)-kx$ potential. We record the Barkhausen noise in polycristalline ${FeSi}$ materials, and compare the pulse shape with the one predicted by the domain wall model.