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The microstate of geometrically frustrated two-dimensional arrays of strongly interacting nanomagnets is controlled by means of topological defect-driven magnetic writing, to the extent that elusive configurations such as the ground state and negative-temperature states are realized.

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Fig. 1: Switching sets of magnetic moments.

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Correspondence to Cristiano Nisoli.

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Nisoli, C. Write it as you like it. Nature Nanotech 13, 5–6 (2018). https://doi.org/10.1038/s41565-017-0021-y

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