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Magnetic skyrmions are promising candidates as information carriers in logicor storage devices thanks to their robustness, guaranteed by the topologicalprotection, and their nanometric size. Currently, little is known about theinfluence of parameters such as disorder, defects or external stimuli, on thelong-range spatial distribution and temporal evolution of the skyrmion lattice.Here, using a large (7.3x7.3{\mu}m$^{2}$) single crystal nano-slice ofCu$_{2}$OSeO$_{3}$, we image up to 70,000 skyrmions, by means of cryo-LorentzTransmission Electron Microscopy as a function of the applied magnetic field.The emergence of the skyrmion lattice from the helimagnetic phase is monitored,revealing the existence of a glassy skyrmion phase at the phase transitionfield, where patches of an octagonally distorted skyrmion lattice are alsodiscovered. In the skyrmion phase, dislocations are shown to cause theemergence and switching between domains with different lattice orientations andthe temporal fluctuations of these domains is filmed. These results demonstratethe importance of direct-space and real-time imaging of skyrmion domains foraddressing both their long-range topology and stability.

Filming the formation and fluctuation of Skyrmion domains by cryo-Lorentz Transmission Electron Microscopy