Multi-domain Characterization of Ferroelectric Switching Dynamics with a Physics-based SPICE Circuit Model for Phase Field Simulations

TL;DR

This paper develops a physics-based SPICE circuit model for multi-domain ferroelectric switching, calibrated with experiments, revealing how domain interactions influence transient behaviors and negative capacitance in ferroelectric devices.

Contribution

It introduces the first circuit-compatible phase field SPICE model for multi-domain ferroelectric switching, capturing domain interactions and viscosity effects from experimental data.

Findings

Model accurately reproduces transient negative capacitance.

Domain interactions significantly affect voltage transient behaviors.

Domain viscosity dynamics are characterized during switching.

Abstract

In this paper, the multi-domain nature of ferroelectric (FE) polarization switching dynamics in a metal-ferroelectric-metal (MFM) capacitor is explored through a physics-based phase field approach, where the three-dimensional time-dependent Ginzburg-Landau (TDGL) equation and Poisson's equation are self-consistently solved with the SPICE simulator. Systematically calibrated based on the experimental measurements, the model well captures transient negative capacitance in pulse switching dynamics, with domain interaction and viscosity being the key parameters. It is found that the influence of pulse amplitudes on voltage transient behaviors can be attributed to the fact that the FE free energy profile strongly depends on how the domains are interacted. This finding has an important implication on the charge-boost induced by stabilization of negative capacitance in an FE + dielectric (DE) stack since the so-called capacitance matching needs to be designed at a specific operation voltage or frequency. In addition, we extract the domain viscosity dynamics during polarization switching according to the experimental measurements. For the first time, a physics-based circuit-compatible SPICE model for multi-domain phase field simulations is established to reveal the effect of domain interaction on the FE energy profile and microscopic domain evolution.