Strong strain dependence of ferroelectric coercivity in a BiFeO3 film

M. D. Biegalski; D. H. Kim; S. Choudhury; L. Q. Chen; H. M. Christen; K. Dörr

doi:10.1063/1.3569137

Strong strain dependence of ferroelectric coercivity in a BiFeO₃ film

M. D. Biegalski, D. H. Kim, S. Choudhury, L. Q. Chen, H. M. Christen, K. Dörr

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Abstract

The ferroelectric polarization loop of an epitaxial BiFeO₃ film on a piezoelectric substrate has been investigated as a function of continuously and reversibly varied biaxial strain of ε=0.36%-0.51%. Over this range, the ferroelectric coercive field (E_C) at 80 K increases reversibly by 36% with the increasing tensile strain. In contrast, phase-field simulations predict the opposite trend of d E_C/dε<0. Therefore, we attribute the observed E_C (ε) dependence to the strain dependence of domain dynamics, which are not included in thermodynamic models. The strain dependence of the remanent polarization agrees with previous results.

Original language	English (US)
Article number	142902
Journal	Applied Physics Letters
Volume	98
Issue number	14
DOIs	https://doi.org/10.1063/1.3569137
State	Published - Apr 4 2011

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3569137

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title = "Strong strain dependence of ferroelectric coercivity in a BiFeO3 film",

abstract = "The ferroelectric polarization loop of an epitaxial BiFeO3 film on a piezoelectric substrate has been investigated as a function of continuously and reversibly varied biaxial strain of ε=0.36%-0.51%. Over this range, the ferroelectric coercive field (EC) at 80 K increases reversibly by 36% with the increasing tensile strain. In contrast, phase-field simulations predict the opposite trend of d EC/dε<0. Therefore, we attribute the observed EC (ε) dependence to the strain dependence of domain dynamics, which are not included in thermodynamic models. The strain dependence of the remanent polarization agrees with previous results.",

author = "Biegalski, {M. D.} and Kim, {D. H.} and S. Choudhury and Chen, {L. Q.} and Christen, {H. M.} and K. D{\"o}rr",

note = "Funding Information: The research at the CNMS was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE. K.D. acknowledges funding by the Deutsche Forschungsgemeinschaft, FOR520. The work at Pennsylvania State University was supported by DOE under grant DE-FG02-07ER46417.",

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AU - Biegalski, M. D.

AU - Kim, D. H.

AU - Choudhury, S.

AU - Chen, L. Q.

AU - Christen, H. M.

AU - Dörr, K.

N1 - Funding Information: The research at the CNMS was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE. K.D. acknowledges funding by the Deutsche Forschungsgemeinschaft, FOR520. The work at Pennsylvania State University was supported by DOE under grant DE-FG02-07ER46417.

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N2 - The ferroelectric polarization loop of an epitaxial BiFeO3 film on a piezoelectric substrate has been investigated as a function of continuously and reversibly varied biaxial strain of ε=0.36%-0.51%. Over this range, the ferroelectric coercive field (EC) at 80 K increases reversibly by 36% with the increasing tensile strain. In contrast, phase-field simulations predict the opposite trend of d EC/dε<0. Therefore, we attribute the observed EC (ε) dependence to the strain dependence of domain dynamics, which are not included in thermodynamic models. The strain dependence of the remanent polarization agrees with previous results.

AB - The ferroelectric polarization loop of an epitaxial BiFeO3 film on a piezoelectric substrate has been investigated as a function of continuously and reversibly varied biaxial strain of ε=0.36%-0.51%. Over this range, the ferroelectric coercive field (EC) at 80 K increases reversibly by 36% with the increasing tensile strain. In contrast, phase-field simulations predict the opposite trend of d EC/dε<0. Therefore, we attribute the observed EC (ε) dependence to the strain dependence of domain dynamics, which are not included in thermodynamic models. The strain dependence of the remanent polarization agrees with previous results.

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Strong strain dependence of ferroelectric coercivity in a BiFeO₃ film

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