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In this theoretical investigation we address the effect of defects on thermalexcitations in square-lattice dipolar arrays. The geometry of the nanomagnets,adopted from recent experiments [A. Farhan \textit{et al.}, Nature Phys.\\textbf{9} (2013) 375], allows for thermal activation at room temperature. Itturns out that excitations can efficiently be pinned at defects. Furthermore,ferromagnetic strings of nanomagnets that connect a pair of defects can beproduced; their lengths are closely related to the distance of the defects andthe topology of the magnetic ground-state configuration. We discuss varioustypes of defects, all of which can be produced by microstructuring techniques.

Pinning of thermal excitations at defects in artificial spin-ice dipolar arrays: A theoretical investigation