USE OF THE ONE-AND-A-HALF-SPECTRUM TO DETERMINE BARKHAUSEN NOISE ASYMMETRY

We demonstrate the use of the one-and-a-half spectrum as a way of looking at the time-asymmetry of Barkhausen noise. This method is of particular value because it allows us to look in the regime where individual Barkhausen pulses are no longer distinguishable. We use the one-and-a-half spectrum on Barkhausen data from two different ferromagnetic samples and find asymmetries in the noise of both. The magnitude of the asymmetry is different in the two samples and we find no clear change in the asymmetry when we move from the regime of well-separated jumps at low field rate to the continuous fluctuating signal at higher rates.