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Defects have a significant influence on the polarization and electromechanical properties of ferroelectric materials. Statistically, they can be seen as random pinning centers acting on an elastic manifold, slowing domain-wall propagation and raising the energy required to switch polarization. Here we show that the “dressing” of defects can lead to unprecedented control of domain-wall dynamics. We engineer defects of two different dimensionalities in ferroelectric oxide thin films—point defects externally induced via bombardment, and extended quasi-one-dimensional domains formed in response to internal strains. The domains act as extended strong pinning sites (as expected) imposing highly localized directional constraints. Surprisingly, the induced point defects in the bombarded samples orient and align to impose further directional pinning, screening the effect of domains. This defect interplay produces more uniform and predictable domain-wall dynamics. Such engineered interactions between defects are crucial for advancements in ferroelectric devices. Published by the American Physical Society2024more » « less
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Dhingra, Archit; Sando, Daniel; Lu, Po-Shen; Marzouk, Zoe G.; Nagarajan, Valanoor; Dowben, Peter A. (, Journal of Applied Physics)
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