  We study the ultra slow domain wall motion in ferromagnetic thin films driven
by a weak magnetic field. Using time resolved magneto-optical Kerr effect
microscopy, we access to the statistics of the intermittent thermally activated
domain wall jumps between deep metastable states. Our observations are
consistent with the existence of creep avalanches: roughly independent clusters
with broad size and ignition waiting-time distributions, each one composed by a
large number of spatio-temporally correlated thermally activated elementary
events. Moreover, we evidence that the large scale geometry of domain walls is
better described by depinning rather than equilibrium universal exponents.
