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Magneto-optical images of flux penetration into the virgin state of thin films with widths of 1.6, 0.4, and at (a) and (b). Numerous dendritic structures were formed by abrupt flux avalanches. The applied field is .
Magnetization hysteresis loops for films with different widths at 5 (a) and (b). The noisy region around is a result of dendritic flux avalanches. Inset: the virgin branches of the loops.
Upper threshold field for dendritic avalanches vs film width extracted from the experimental data of Fig. 2 (symbols) and from the theoretical fit using the model of Ref. 15.
Avalanche-induced reduction of .
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