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Artificial spin ices are periodic arrangements of interacting nanomagnetssuccessfully used to investigate emergent phenomena in the presence ofgeometric frustration. Recently, it has been shown that artificial spin icescan be used as building blocks for creating functional materials, such asmagnonic crystals, and support a large number of programmable magnetic states.We investigate the magnetization dynamics in a system exhibiting anisotropicmagnetostatic interactions owing to locally broken structural inversionsymmetry. We find a rich spin-wave spectrum and investigate its evolution in anexternal magnetic field. We determine the evolution of individual modes, frombuilding blocks up to larger arrays, highlighting the role of symmetry breakingin defining the mode profiles. Moreover, we demonstrate that the mode spectraexhibit signatures of long-range interactions in the system. These resultscontribute to the understanding of magnetization dynamics in spin ices beyondthe kagome and square ice geometries and are relevant for the realization ofreconfigurable magnonic crystals based on spin ices.

Spin-wave dynamics and symmetry breaking in an artificial spin ice