Self-organization of domain growth in the Ising model with impurities

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We have studied avalanchelike rearrangements of domain patterns in the two-dimensional Ising model with static impurities, which is quenched to low temperatures. When breaking the up-down symmetry of the spins by a small applied field, the mere fluctuation of a single spin eventually results in a cascade of spin flips at the domain boundaries. We have analyzed the lifetime and size distribution functions for the avalanches and related the results to the general phenomena of self-organized criticality and to recent experiments on cellular magnetic domain patterns in magnetic garnet films. Our results suggest that the self-organized state in this system appears to be subcritical, in agreement with a recent theory.

Original languageEnglish
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number8
Pages (from-to)R5331-R5334
Publication statusPublished - 1992
Externally publishedYes

ID: 236891851