Piezoresponse of ferroelectric films in ferroionic states: Time and voltage dynamics

Morozovska, Anna N.; Eliseev, Eugene A.; Morozovsky, Nicholas V.; Kalinin, Sergei V.

doi:10.1063/1.4979824

Piezoresponse of ferroelectric films in ferroionic states: Time and voltage dynamics

Journal Article · Mon May 01 00:00:00 EDT 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4979824· OSTI ID:1871133

Morozovska, Anna N. ^[1]; Eliseev, Eugene A. ^[2]; Morozovsky, Nicholas V. ^[2]; ^[3]

National Academy of Sciences of Ukraine, Kyiv
National Academy of Sciences of Ukraine
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, the interplay between electrochemical surface charges and bulk ferroelectricity in thin films gives rise to a continuum of coupled ferro-ionic states. These states are exquisitely sensitive to chemical and electric conditions at the surfaces, applied voltage, and oxygen pressure. Using the analytical approach combining the Ginzburg-Landau-Devonshire description of the ferroelectricity with the Langmuir adsorption isotherm for the ions at the film surface, we have studied the temperature-, time- and field-dependent polarization changes and electromechanical response of the ferro-ionic states. The responses are found to be inseparable in thermodynamic equilibrium and at low frequencies of applied voltage. The states become separable in the high frequency dynamic mode due to the several orders of magnitude difference in the relaxation times of ferroelectric polarization and surface ion charge density. These studies provide an insight into the dynamic behavior of nanoscale ferroelectrics with an open surface exposed to different kinds of the electrochemically active gaseous surrounding.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Academy of Sciences of Ukraine; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1871133

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 18 Vol. 110; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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