Nonlinear dielectric properties of paraelectric (Ba,Sr)TiO3 thin films with isotropic and anisotropic epitaxy

作者：Simon W K; Bellotti J A; Akdogan E K; Safari A^*

来源：Ferroelectrics, 2006, 333: 185-191.

DOI：10.1080/00150190600701236

• dielectric
• paraelectric
• thin films
• tunability
• microwave

The effects of isotropic and anisotropic epitaxy on the nonlinear dielectric response in (Ba-0.6,Sr0.4TiO3 ) thin films were investigated experimentally. Under isotropic epitaxy, it is shown that the misfit is detrimental to the non-linear response of the films with decreasing film thickness. Nonlinear dielectric properties of films with in-plane compression exhibit more pronounced strain dependence, while the same does not set-in in film under tension down to 200 nm in thickness. In the case of anisotropic epitaxy, tunability exhibits directional dependence in the plane of the film and possesses orthorhombic symmetry in accordance to the Curie principle. The nonlinear dielectric response was found to be greater along the compressed directions.

• 出版日期2006