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Mechanically Induced Ferroelectric Switching in BaTiO 3 Thin Films

47 Pages Posted: 14 Oct 2019 First Look: Under Review

See all articles by Bo Wang

Bo Wang

Pennsylvania State University - Materials Science Institute

Haidong Lu

University of Nebraska at Lincoln - Department of Physics and Astronomy

Chung Wung Bark

University of Wisconsin - Madison - Department of Materials Science and Engineering

Chang-Beom Eom

University of Wisconsin - Madison - Department of Materials Science and Engineering

Alexei Gruverman

University of Nebraska at Lincoln - Department of Physics and Astronomy

Long-Qing Chen

Pennsylvania State University - Department of Materials Science and Engineering; Pennsylvania State University - Materials Science Institute

Abstract

The ability to reverse or switching the polarization of a ferroelectric thin film through a mechanical force under an atomic force microscopy (AFM) tip offers the exciting possibility of a voltage-free control of ferroelectricity. One of the important metrics for characterizing such a switching process is the critical force Fc required to reverse a polarization. However, the experimentally measured values of Fc display a large uncertainty and vary significantly even for the same ferroelectric film. Here, using BaTiO3 thin films as a model system, we systematically evaluate Fc using a combination of AFM-based experiments and phase-field simulations. In particular, we study the influence of the AFM tip radius, misfit strain, and film thickness on Fc as well as the interplay between the flexoelectric and piezoelectric effects. This work provides a deeper understanding on the mechanism and control of mechanically induced ferroelectric switching and thus guidance for exploring potential ferroelectric-based nanodevices based on mechanical switching.

Keywords: Domain switching, Flexoelectric effect, Ferroelectric thin film, Phase-field simulation

Suggested Citation

Wang, Bo and Lu, Haidong and Bark, Chung Wung and Eom, Chang-Beom and Gruverman, Alexei and Chen, Long-Qing, Mechanically Induced Ferroelectric Switching in BaTiO 3 Thin Films. Available at SSRN: https://ssrn.com/abstract=3467754

Bo Wang (Contact Author)

Pennsylvania State University - Materials Science Institute ( email )

United States

Haidong Lu

University of Nebraska at Lincoln - Department of Physics and Astronomy

United States

Chung Wung Bark

University of Wisconsin - Madison - Department of Materials Science and Engineering

Madison, WI 53706
United States

Chang-Beom Eom

University of Wisconsin - Madison - Department of Materials Science and Engineering

Madison, WI 53706
United States

Alexei Gruverman

University of Nebraska at Lincoln - Department of Physics and Astronomy

United States

Long-Qing Chen

Pennsylvania State University - Department of Materials Science and Engineering ( email )

University Park
State College, PA 16802
United States

Pennsylvania State University - Materials Science Institute ( email )

United States

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