Influence of dipolar defects on switching behavior in ferroelectrics

Rajeev Ahluwalia, Wenwu Cao

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

By including the contributions of dipolar defects in the time-dependent Ginzburg-Landau theory, we have simulated the domain switching process in ferroelectrics. The model incorporates elastic effects in the form of an anisotropic long-range interaction that is obtained by integrating out the strain fields, subject to the elastic compatibility constraint. The defects are simulated by considering an inhomogeneous electric field due to randomly placed coarse-grained dipoles. It is shown that these defects act as nuclei for the formation of 90° twinned structures, resulting in a lower coercive field compared to the defect-free case. Due to these defects, the simulated polarization switching occurs by two successive 90° rotations, rather than a single 180° flipping as in the defect-free case.

Original languageEnglish (US)
Article number012103
Pages (from-to)121031-121034
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number1
StatePublished - Jan 1 2001

Fingerprint

Ferroelectric materials
Defects
defects
compatibility
Electric fields
Polarization
dipoles
nuclei
electric fields
polarization
interactions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

@article{5abf3ebd3f664a54a371e5ce15103090,
title = "Influence of dipolar defects on switching behavior in ferroelectrics",
abstract = "By including the contributions of dipolar defects in the time-dependent Ginzburg-Landau theory, we have simulated the domain switching process in ferroelectrics. The model incorporates elastic effects in the form of an anisotropic long-range interaction that is obtained by integrating out the strain fields, subject to the elastic compatibility constraint. The defects are simulated by considering an inhomogeneous electric field due to randomly placed coarse-grained dipoles. It is shown that these defects act as nuclei for the formation of 90° twinned structures, resulting in a lower coercive field compared to the defect-free case. Due to these defects, the simulated polarization switching occurs by two successive 90° rotations, rather than a single 180° flipping as in the defect-free case.",
author = "Rajeev Ahluwalia and Wenwu Cao",
year = "2001",
month = "1",
day = "1",
language = "English (US)",
volume = "63",
pages = "121031--121034",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "1",

}

Influence of dipolar defects on switching behavior in ferroelectrics. / Ahluwalia, Rajeev; Cao, Wenwu.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 63, No. 1, 012103, 01.01.2001, p. 121031-121034.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Influence of dipolar defects on switching behavior in ferroelectrics

AU - Ahluwalia, Rajeev

AU - Cao, Wenwu

PY - 2001/1/1

Y1 - 2001/1/1

N2 - By including the contributions of dipolar defects in the time-dependent Ginzburg-Landau theory, we have simulated the domain switching process in ferroelectrics. The model incorporates elastic effects in the form of an anisotropic long-range interaction that is obtained by integrating out the strain fields, subject to the elastic compatibility constraint. The defects are simulated by considering an inhomogeneous electric field due to randomly placed coarse-grained dipoles. It is shown that these defects act as nuclei for the formation of 90° twinned structures, resulting in a lower coercive field compared to the defect-free case. Due to these defects, the simulated polarization switching occurs by two successive 90° rotations, rather than a single 180° flipping as in the defect-free case.

AB - By including the contributions of dipolar defects in the time-dependent Ginzburg-Landau theory, we have simulated the domain switching process in ferroelectrics. The model incorporates elastic effects in the form of an anisotropic long-range interaction that is obtained by integrating out the strain fields, subject to the elastic compatibility constraint. The defects are simulated by considering an inhomogeneous electric field due to randomly placed coarse-grained dipoles. It is shown that these defects act as nuclei for the formation of 90° twinned structures, resulting in a lower coercive field compared to the defect-free case. Due to these defects, the simulated polarization switching occurs by two successive 90° rotations, rather than a single 180° flipping as in the defect-free case.

UR - http://www.scopus.com/inward/record.url?scp=0035121448&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035121448&partnerID=8YFLogxK

M3 - Article

VL - 63

SP - 121031

EP - 121034

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 1

M1 - 012103

ER -