Correlation effects in Barkhausen noise and magnetic attenuation in soft ribbons

TL;DR

This study investigates how magnetization reversals in amorphous Fe-based ribbons affect Barkhausen noise signals, developing a mathematical model to analyze signal attenuation and localize reversal events.

Contribution

The paper introduces a novel method and mathematical model to extract the attenuation function of Barkhausen signals, enabling localization of magnetization reversals in amorphous ribbons.

Findings

Attenuation function is relatively independent of coil distance.

Model accurately extracts reversal location information.

Provides insights into correlation effects in Barkhausen noise.

Abstract

The propagation of the effects connected with the occurrence of magnetization reversals in an amorphous ribbon of Fe$_{63}$B$_{64}$Si$_{8}$Ni$_{15}$ has been investigated using a method based on two pickup coils separated by a distance variable between 2 an 40 mm. The ratio $R$ between the voltage signals induced in the coils contains information on the location where the magnetization reversal took place. This information can be extracted by knowing the function $V(x)$ which represents the attenuation of a signal generated by a reversal that took place at a distance x from the coil. A mathematical model for extracting this function starting from the histogram of the experimentally measured values of $R$ is presented. The attenuation function obtained in this way is relatively independent on the distance between the coils, and this is in strong support of the correctness of the model adopted.