TY - JOUR
T1 - Non-linearity in engineered lead magnesium niobate (PbMg1/3Nb2/3O3) thin films
AU - Shetty, Smitha
AU - Kim, Jieun
AU - Martin, Lane W.
AU - Trolier-Mckinstry, Susan
N1 - Funding Information:
This work was funded by the Penn State MRSEC, Center for Nanoscale Science, under Award No. NSF DMR-1420620. The authors would also like to acknowledge the help of Jeff Long in electrical characterization setup. L. W. Martin acknowledges support from the National Science Foundation (NSF) under Grant No. DMR-1708615.
Publisher Copyright:
© 2020 American Institute of Physics Inc.. All rights reserved.
PY - 2020/11/21
Y1 - 2020/11/21
N2 - The local compositional heterogeneity associated with the lack of long-range ordering of Mg2+and Nb5+in PbMg1/3Nb2/3O3(PMN) is correlated with its characteristic "relaxor" ferroelectric behavior. Earlier work [Shetty et al., Adv. Funct. Mater. 29, 1804258 (2019)] examined the relaxor behavior in PMN thin films grown at temperatures below 1073 K by artificially reducing the degree of disorder via synthesis of heterostructures with alternate layers of Pb(Mg2/3Nb1/3)O3and PbNbO3, as suggested by the "random-site model." This work confirmed the development of ferroelectric domains below 150 K in long-range-ordered films, epitaxially grown on (111) SrTiO3substrates using alternate target timed pulsed-laser deposition of Pb(Mg2/3Nb1/3)O3and PbNbO3targets with 20% excess Pb. In this work, the first through third-harmonic dielectric charge displacement densities and complex dielectric susceptibilities were analyzed as a function of temperature and frequency in zero-field-cooled PMN films with short- A nd long-range ordering. The long-range ordering decreased the dispersion in the first- A nd third-harmonic dielectric charge displacement densities relative to short-range-ordered films. It was found that the one-dimensional ordering achieved in the long-range-ordered film is insufficient to achieve a fully normal ferroelectric state. In the presence of quenched random electric fields, these films require a small ac field to facilitate percolation of the polar nano-regions, enabling normal ferroelectric-like behavior at lower temperature (T < 240 K). The films behave like a typical relaxor near room temperature. With reduced ordering, the short-range films exhibit greater dispersion in linear and higher order harmonic dielectric charge displacement density.
AB - The local compositional heterogeneity associated with the lack of long-range ordering of Mg2+and Nb5+in PbMg1/3Nb2/3O3(PMN) is correlated with its characteristic "relaxor" ferroelectric behavior. Earlier work [Shetty et al., Adv. Funct. Mater. 29, 1804258 (2019)] examined the relaxor behavior in PMN thin films grown at temperatures below 1073 K by artificially reducing the degree of disorder via synthesis of heterostructures with alternate layers of Pb(Mg2/3Nb1/3)O3and PbNbO3, as suggested by the "random-site model." This work confirmed the development of ferroelectric domains below 150 K in long-range-ordered films, epitaxially grown on (111) SrTiO3substrates using alternate target timed pulsed-laser deposition of Pb(Mg2/3Nb1/3)O3and PbNbO3targets with 20% excess Pb. In this work, the first through third-harmonic dielectric charge displacement densities and complex dielectric susceptibilities were analyzed as a function of temperature and frequency in zero-field-cooled PMN films with short- A nd long-range ordering. The long-range ordering decreased the dispersion in the first- A nd third-harmonic dielectric charge displacement densities relative to short-range-ordered films. It was found that the one-dimensional ordering achieved in the long-range-ordered film is insufficient to achieve a fully normal ferroelectric state. In the presence of quenched random electric fields, these films require a small ac field to facilitate percolation of the polar nano-regions, enabling normal ferroelectric-like behavior at lower temperature (T < 240 K). The films behave like a typical relaxor near room temperature. With reduced ordering, the short-range films exhibit greater dispersion in linear and higher order harmonic dielectric charge displacement density.
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U2 - 10.1063/5.0003635
DO - 10.1063/5.0003635
M3 - Article
AN - SCOPUS:85096916922
VL - 128
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 19
M1 - 0003635
ER -