Intermittency of Barkhausen avalanche in Co nanothin films

Abstract

We investigate the statistical distribution of separation time DeltaT between the adjacent two Barkhausen jumps in Co films having the thickness ranging from 5 to 50 nm. By means of a magneto-optical microscope magnetometer, we determine the time-dependent magnetization curve and the separation time DeltaT between two jump events during avalanche process from the directly observed time-resolved domain evolution patterns. Through a statistical analysis of DeltaT, we find that the distribution P(DeltaT) seems to follow a power-law behavior with the same form within the error range, irrespective of the film thickness. (C) 2004 American Institute of Physics.