Abstract
Cellular magnetic domains in magnetic garnet films are a rich and experimentally accessible system in which to study the dynamics of patterns in two dimensional systems. The evolution of these patterns with increasing magnetic field is governed to a large extent by topological constraints. We describe two phenomena relevant to current issues in condensed matter physics: 1) Front mediated transitions that “melt” ordered hexagonal domain lattices, leaving behind a disordered cellular “froth”, and 2) Avalanche-like topological rearrangements of disordered cellular patterns which have the signatures of self-organized criticality, including power law distributions of avalanche size and duration, with exponents that correspond to “1/f” noise.
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