Defect-Enhanced Polarization Switching in the Improper Ferroelectric LuFeO3

Publication Type:

Journal Article

Authors:

P. Barrozo; D.R. Småbråten; Y.-L. Tang; B. Prasad; S. Saremi; R. Ozgur; V. Thakare; R.A. Steinhardt; M.E. Holtz; V.A. Stoica; L.W. Martin; D.G. Schlom; S.M. Selbach; Ramamoorthy Ramesh

Source:

Advanced Materials, Wiley-VCH Verlag (2020)

Keywords:

Calculations, defects, Enhanced polarization, Ferroelectric materials, ferroelectricity, First-principles calculation, Frequency dispersion, Growth rate, Improper ferroelectrics, iron compounds, Lead titanate, Lutetium compounds, Structural order parameter, Switching, Switching behaviors, Switching dynamics, Switching voltages

Abstract:

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. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Notes:

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