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Titolo:
Direct observation of domain dynamics in lead zirconate titanate thin films
Autore:
Ganpule, CS; Nagarajan, V; Li, H; Ogale, AS; Martinez, AD; Ogale, SB; Aggarwal, S; Williams, E; De Wolf, P; Ramesh, R;
Indirizzi:
Univ Maryland, Mat Res Sci & Engn Ctr, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 Engn Ctr, College Pk, MD 20742 USA Digital Instruments, Santa Barbara, CA 93117 USA Digital Instruments Santa Barbara CA USA 93117 anta Barbara, CA 93117 USA
Titolo Testata:
INTEGRATED FERROELECTRICS
fascicolo: 1-4, volume: 32, anno: 2001,
pagine: 891 - 900
SICI:
1058-4587(2001)32:1-4<891:DOODDI>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
SCANNING FORCE MICROSCOPY; SOLID-SOLUTION SYSTEM; FERROELECTRIC PROPERTIES; THERMODYNAMIC THEORY; RETENTION; ELECTRODES;
Keywords:
polarization reversal; relaxation; piezoresponse microscopy; AFM; 90 degrees domains; domain dynamics; stretched exponential;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Ganpule, CS Univ Maryland, Mat Res Sci & Engn Ctr, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 ollege Pk, MD 20742 USA
Citazione:
C.S. Ganpule et al., "Direct observation of domain dynamics in lead zirconate titanate thin films", INTEGR FERR, 32(1-4), 2001, pp. 891-900

Abstract

We report observations of the ferroelectric domain structure in epitaxial lead zirconate titanate (PZT) ferroelectric thin films using piezoresponse microscopy. Epitaxial PZT films with a nominal composition of PbZr0.2Ti0.8O3 were deposited onto single crystal SrTiO3 substrates by pulsed laser deposition, with an epitaxial layer of La-Sr-Co-O as the bottom electrode. By manipulating the film thickness, a uniform 2-dimensional grid of 90 degrees domains (a-domains, i.e., c-axis in the plane of the film) has been induced. Our studies show that the polarization direction in the film is substantially preferentially oriented and that nucleation of reverse 180 degrees domains occurs preferentially at 90 degrees domain interfaces. Polarization reversal occurs through the nucleation and subsequent growth of "semicircular/elliptical" reverse domains, which subsequently consume the entire region as a function of reversal time. The reversal is seen to fit a stretched exponential.

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Documento generato il 31/03/20 alle ore 04:53:03