Defect-Enhanced Polarization Switching in the Improper Ferroelectric LuFeO3
Peer reviewed, Journal article
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OriginalversjonAdvanced Materials. 2020, 32 (23), . 10.1002/adma.202000508
Results of switching behavior of the improper ferroelectric LuFeO3 are presented. Using a model set of films prepared under controlled chemical and growth‐rate conditions, it is shown that defects can reduce the quasi‐static switching voltage by up to 40% in qualitative agreement with first‐principles calculations. Switching studies show that the coercive field has a stronger frequency dispersion for the improper ferroelectrics compared to a proper ferroelectric such as PbTiO3. It is concluded that the primary structural order parameter controls the switching dynamics of such improper ferroelectrics.