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Dislocations Induce Ordered Polar Topologies in Antiferroelectric Thin Films

Researchers have shown that crystal dislocations in antiferroelectric PbZrO₃ thin films act as nucleation sites for ordered polar anti‑hedgehog lattices. Using atomic‑resolution TEM and phase‑field modeling, they demonstrated that electrostrictive and flexoelectric coupling at dislocation cores generates local electric fields strong enough to rotate dipoles despite antiferroelectric antiparallel coupling. This creates a checkerboard‑like topological polar pattern previously unattainable in antiferroelectrics. The finding establishes a defect‑engineering strategy for polar topologies with implications for memory and logic devices.