Nucleation and avalanches in films with labyrinthine magnetic domains

Details Nucleation and avalanches in films with labyrinthine magnetic domains Nucleation and avalanches in films with labyrinthine magnetic domains

2011-11-14

arxiv.org/abs/1111.3140v2

Phys. Rev. B 84 (2011) 214441

Physics

Condensed Matter

Disordered Systems and Neural Networks

Scientific paper

Experimental investigations of the scaling behavior of Barkhausen avalanches in out-of-plane ferromagnetic films yield widely different results for the values of the critical exponents despite similar labyrinthine domain structures, suggesting that universality may not hold for this class of materials. Analyzing a phase field model for magnetic reversal, we show that avalanche scaling is bounded by characteristic lengthscales arising from the competition between dipolar forces and exchange interactions. We compare our results with the experiments and find a good qualitative and quantitative agreement, reconciling apparent contradictions. Finally, we make some prediction, amenable to experimental verification, on the dependence of the avalanches behavior from the film thickness and disorder.

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