Correlations of triggering noise in driven magnetic clusters

Details Correlations of triggering noise in driven magnetic clusters Correlations of triggering noise in driven magnetic clusters

2000-03-13

arxiv.org/abs/cond-mat/0003204v1

Physica A 282 (2000) 362-374

Physics

Condensed Matter

Statistical Mechanics

7 pages, Revtex, 4 figures

Scientific paper

10.1016/S0378-4371(00)00099-6

We show that the temporal fluctuations $\Delta H(t)$ of the threshold driving field $H(t)$, which triggers an avalanche in slowly driven disordered ferromagnets with many domains, exhibit long-range correlations in space and time. The probability distribution of the distance between {\it successive} avalanches as well as the distribution of trapping times of domain wall at a given point in space have fractal properties with the universal scaling exponents. We show how these correlations are related to the scaling behavior of Barkhausen avalanches occurring by magnetization reversal. We also suggest a transport equation which takes into account the observed noise correlations.

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