We suggest a new theoretical approach describing the velocity of magneticflux dendrite penetration into thin superconducting films. The key assumptionsfor this approach are based upon experimental observations. We treat a dendritetip motion as a propagating flux jump instability. Two different regimes ofdendrite propagation are found. A fast initial stage is followed by a slowstage, which sets in as soon as a dendrite enters into the vortex-free region.We find that the dendrite velocity is inversely proportional to the samplethickness. The theoretical results and experimental data obtained by amagneto-optic pump-probe technique are compared and excellent agreement betweenthe calculations and measurements is found.
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