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Flux distributions in thin superconducting NbN films placed in aperpendicular magnetic field have been studied using magneto-optical imaging.Below 5.5 K the flux penetrates in the form of abrupt avalanches resulting indendritic structures. Magnetization curves in this regime exhibit extremelynoisy behavior. Stability is restored both above a threshold temperature T* andapplied field H*, where H* is smaller for increasing field than during descent.The dendrite size and morphology are strongly T dependent, and fractal analysisof the first dendrites entering into a virgin film shows that dendrites formedat higher T have larger fractal dimension.Comment: 3 pages, 5 figure

Avalanche-driven fractal flux distributions in NbN superconducting films