Abstract
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 language | English |
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Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
Volume | 45 |
Issue number | 8 |
Pages (from-to) | R5331-R5334 |
ISSN | 2469-9926 |
DOIs | |
Publication status | Published - 1992 |
Externally published | Yes |