A model of ferroelectric behavior based on a complete switching density

Abstract

High resolution study of domain nucleation and growth during polarization switching in Pb(Zr,Ti)O 3 ferroelectric thin film capacitorsIn this article, a ferroelectric capacitor is characterized by an experimental Preisach density ͑PD͒, determined by first order reversal curves ͑FORC͒ method. It is experimentally shown that this density, defined under the usual Preisach assumptions, does not allow a complete model of the ferroelectric behavior. Considering the domain walls phenomenon, an extension of the Preisach assumptions is suggested, leading to the complete switching density ͑CSD͒ defined on the whole Preisach plane. It is theoretically shown that the experimental PD determined by the FORC method is an exact image of the CSD truncated outside of the so-called Preisach triangle. It is finally verified that the CSD improves the ferroelectric modeling on a wide range of electric field strength, including the Rayleigh zone.

Nontrivial dependence of dielectric stiffness on bias field in relaxors and dipole glasses

“…Due to the random fields and distribution of T c 's, this jump diffuses. 29,30 This can be described by introducing a distribution function f (e,T c ) (see the way how to determine the distribution function from experiment in Ref. 30):…”

Influence of stoichiometry on the dielectric and ferroelectric properties of the tunable (Ba,Sr)TiO3 ceramics investigated by First Order Reversal Curves method

“…non-switching/switching) contributions to the polarization and the field-dependence of the differential susceptibilities by using the same experimental data. [13][14][15][16][17] The experiment involves measurement of minor hysteresis loops between the positive saturation +E sat and a variable reversal field E r ∈ (−E sat , +E sat ) according to the following sequence (as presented in Fig. 1): (i) saturation under a positive field E ≥ +E sat ; (ii) ramping down to the reversal field E r , along the descending branch of the major hysteresis loop (MHL); (iii) increasing the field back to +E sat , when P is a function of the fields E and E r (this is called a FORC curve).…”

Physical reality of the Preisach model for organic ferroelectrics

“…Although originally developed to describe magnetic hysteresis, the Preisach model 1 has also successfully been applied to describe hysteretic switching in ferroelectrics 2 – 4 . The basic assumption of the Preisach model is that a macroscopic ferroelectric consists of a distribution of microscopic hysterons with a rectangular hysteresis loop.…”