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arXiv · 2501.09820

Wave dynamics in a macroscopic square artificial spin ice

L. Scafuri·D. A. Bozhko·E. Iacocca
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Abstract

A macroscopic square artificial spin ice, or macro-ASI, is a collection of bar magnets placed in a square lattice arrangement. Each magnet is supported by hinges that allow their mechanical rotation. Previous investigations in these structures have shown ground-state configurations and driven dynamics similar to those of their nanosized counterparts. Here, we numerically investigate the impact of a defect, a Dirac string, on the driven dynamics. We find that waves quickly lose coherence by scattering between modes in this system. In addition, we observe a distinct mode associated with the isolated oscillation of the Dirac string. As expected from spatial localization, this resonant mode is under the band of propagating waves in the macro-ASI. The results are analogous to the development of low-frequency edge modes in nanoscopic spin ices in the presence of defects. Our results provide valuable insight into the physics of mechano-magnetic systems, demonstrating the existence of wave scattering and spatial confinement phenomena in macro-ASIs.

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L. Scafuri, D. A. Bozhko, E. Iacocca. 2025-01-16. Wave dynamics in a macroscopic square artificial spin ice. https://arxiv.org/abs/2501.09820

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