Correlation effects in Barkhausen noise and magnetic attenuation in soft ribbons

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.