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Using low-energy electron microscopy, we image in real time the intercalationof a cobalt monolayer between graphene and the (111) surface of iridium. Ourmeasurements reveal that the edges of a graphene flake represent an energybarrier to intercalation. Based on a simple description of the growth kinetics,we estimate this energy barrier and find small, but substantial, localvariations. These local variations suggest a possible influence of the grapheneorientation with respect to its substrate and of the graphene edge terminationon the energy value of the barrier height. Besides, our measurements show thatintercalated cobalt is energetically more favorable than cobalt on bareiridium, indicating a surfactant role of graphene.

Intercalating cobalt between graphene and iridium (111): a spatially-dependent kinetics from the edges