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Evolution of disorder in two-dimensional stripe patterns: "Smectic" instabilities and disclination unbinding.

A combination of video polarization microscopy and extensive digital line pattern analysis has been invoked to examine in quantitative detail the transformation of a lamellar into a «labyrinthine» magneticstripe domain pattern. The evolution of disorder is found to be mediated by a sequence of transverse, «smectic» instabilities culminating in the generation of disclination dipoles. Their subsequent continuous «unbinding» facilitates the formation of a globally isotropic nonequilibrium pattern adopting the topology of a binary tree and displaying a well-defined morphology with a motif in the form of oblong, polygonal clusters of linear-stripe segments