High frequency polarization switching of a thin ferroelectric film

TL;DR

This paper investigates high-frequency polarization oscillations in a ferroelectric thin film, combining experimental observations with analytical modeling to understand the oscillation dynamics and match them with theoretical predictions.

Contribution

It provides the first combined experimental and analytical analysis of high-frequency polarization oscillations in ferroelectric thin films, deriving explicit formulas for oscillation frequency and decay time.

Findings

High frequency (~10^8 rad/s) polarization oscillations observed experimentally.

Analytical expressions for oscillation frequency and decay time derived.

Theoretical estimations agree well with experimental data.

Abstract

We consider both experimentally and analytically the transient oscillatory process that arises when a rapid change in voltage is applied to a $Ba_xSr_{1-x}TiO_3$ ferroelectric thin film deposited on an $Mg0$ substrate. High frequency ($\approx 10^{8} rad/s$) polarization oscillations are observed in the ferroelectric sample. These can be understood using a simple field-polarization model. In particular we obtain analytic expressions for the oscillation frequency and the decay time of the polarization fluctuation in terms of the material parameters. These estimations agree well with the experimental results.