Fig. 7: XMCD-PEEM images of all steps from the relevant unipolar clock protocol series.

Time starts at t = 0, and is incremented by 1 for each clock step, with clock pulses indicated by the labels. The black (rightwards) domains grow with application of AB clocking, and quickly reverses with ab clocking. Red circle highlights: The short, vertical domain wall terminating the black domain in the center region of snapshot t = 20 exemplifies both avalanching domain growth and a stuck domain wall. In snapshot t = 21 the top part of the domain wall has progressed in an avalanche to form a finger extension of the domain, while the bottom part of the domain wall remains as before.