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Collective dynamics often play an important role in determining the stabilityof ground states for both naturally occurring materials and metamaterials. Westudied the temperature dependent dynamics of antiferromagnetically orderedsuperdomains in a square artificial spin lattice using soft x-ray photoncorrelation spectroscopy. We observed an exponential slowing down ofsuperdomain wall motion below the AF onset temperature, similar to the behaviorof typical bulk antiferromagnets. Using a continuous time random walk model weshow that these superdomain walls undergo low-temperature ballistic andhigh-temperature diffusive motions.

Spontaneous Magnetic Superdomain Wall Fluctuations in an Artificial Antiferromagnet