Structural Evidence for Ultrafast Polarization Rotation in Ferroelectric/Dielectric Superlattice Nanodomains

Weakly coupled ferroelectric/dielectric superlattice thin-film heterostructures exhibit complex nanoscale polarization configurations that arise from a balance of competing electrostatic, elastic, and domain-wall contributions to the free energy. A key feature of these configurations is that the pol...

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Autores principales:	Hyeon Jun Lee, Youngjun Ahn, Samuel D. Marks, Eric C. Landahl, Shihao Zhuang, M. Humed Yusuf, Matthew Dawber, Jun Young Lee, Tae Yeon Kim, Sanjith Unithrattil, Sae Hwan Chun, Sunam Kim, Intae Eom, Sang-Yeon Park, Kyung Sook Kim, Sooheyong Lee, Ji Young Jo, Jiamian Hu, Paul G. Evans
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/e576f4a1cf0a4697aca92bac2741c769
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spelling	oai:doaj.org-article:e576f4a1cf0a4697aca92bac2741c7692021-12-02T17:58:15ZStructural Evidence for Ultrafast Polarization Rotation in Ferroelectric/Dielectric Superlattice Nanodomains10.1103/PhysRevX.11.0310312160-3308https://doaj.org/article/e576f4a1cf0a4697aca92bac2741c7692021-08-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.031031http://doi.org/10.1103/PhysRevX.11.031031https://doaj.org/toc/2160-3308Weakly coupled ferroelectric/dielectric superlattice thin-film heterostructures exhibit complex nanoscale polarization configurations that arise from a balance of competing electrostatic, elastic, and domain-wall contributions to the free energy. A key feature of these configurations is that the polarization can locally have a significant component that is along the thin-film surface normal direction with an overall configuration maintaining zero net in-plane polarization. PbTiO_{3}/SrTiO_{3} thin-film superlattice heterostructures on a conducting SrRuO_{3} bottom electrode on SrTiO_{3} have a room-temperature stripe nanodomain pattern with a nanometer-scale lateral period. Ultrafast time-resolved x-ray free electron laser diffraction and scattering experiments reveal that above-bandgap optical pulses induce propagating acoustic pulses and a perturbation of the domain diffuse scattering intensity arising from the nanoscale stripe domain configuration. With 400-nm optical excitation, two separate acoustic pulses are observed: a high-amplitude pulse resulting from strong optical absorption in the bottom electrode and a weaker pulse arising from the depolarization-field-screening effect due to absorption directly within the superlattice. The picosecond scale variation of the nanodomain diffuse scattering intensity is consistent with a larger polarization change than would be expected due to the polarization-tetragonality coupling of uniformly polarized ferroelectrics. The polarization change is consistent, instead, with polarization rotation facilitated by the reorientation of the in-plane component of the polarization at the domain boundaries of the striped polarization structure. The complex steady-state configuration within these ferroelectric heterostructures leads to ultrafast polarization rotation phenomena that have previously been available only through the selection of bulk crystal composition.Hyeon Jun LeeYoungjun AhnSamuel D. MarksEric C. LandahlShihao ZhuangM. Humed YusufMatthew DawberJun Young LeeTae Yeon KimSanjith UnithrattilSae Hwan ChunSunam KimIntae EomSang-Yeon ParkKyung Sook KimSooheyong LeeJi Young JoJiamian HuPaul G. EvansAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 3, p 031031 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Hyeon Jun Lee Youngjun Ahn Samuel D. Marks Eric C. Landahl Shihao Zhuang M. Humed Yusuf Matthew Dawber Jun Young Lee Tae Yeon Kim Sanjith Unithrattil Sae Hwan Chun Sunam Kim Intae Eom Sang-Yeon Park Kyung Sook Kim Sooheyong Lee Ji Young Jo Jiamian Hu Paul G. Evans Structural Evidence for Ultrafast Polarization Rotation in Ferroelectric/Dielectric Superlattice Nanodomains
description	Weakly coupled ferroelectric/dielectric superlattice thin-film heterostructures exhibit complex nanoscale polarization configurations that arise from a balance of competing electrostatic, elastic, and domain-wall contributions to the free energy. A key feature of these configurations is that the polarization can locally have a significant component that is along the thin-film surface normal direction with an overall configuration maintaining zero net in-plane polarization. PbTiO_{3}/SrTiO_{3} thin-film superlattice heterostructures on a conducting SrRuO_{3} bottom electrode on SrTiO_{3} have a room-temperature stripe nanodomain pattern with a nanometer-scale lateral period. Ultrafast time-resolved x-ray free electron laser diffraction and scattering experiments reveal that above-bandgap optical pulses induce propagating acoustic pulses and a perturbation of the domain diffuse scattering intensity arising from the nanoscale stripe domain configuration. With 400-nm optical excitation, two separate acoustic pulses are observed: a high-amplitude pulse resulting from strong optical absorption in the bottom electrode and a weaker pulse arising from the depolarization-field-screening effect due to absorption directly within the superlattice. The picosecond scale variation of the nanodomain diffuse scattering intensity is consistent with a larger polarization change than would be expected due to the polarization-tetragonality coupling of uniformly polarized ferroelectrics. The polarization change is consistent, instead, with polarization rotation facilitated by the reorientation of the in-plane component of the polarization at the domain boundaries of the striped polarization structure. The complex steady-state configuration within these ferroelectric heterostructures leads to ultrafast polarization rotation phenomena that have previously been available only through the selection of bulk crystal composition.
format	article
author	Hyeon Jun Lee Youngjun Ahn Samuel D. Marks Eric C. Landahl Shihao Zhuang M. Humed Yusuf Matthew Dawber Jun Young Lee Tae Yeon Kim Sanjith Unithrattil Sae Hwan Chun Sunam Kim Intae Eom Sang-Yeon Park Kyung Sook Kim Sooheyong Lee Ji Young Jo Jiamian Hu Paul G. Evans
author_facet	Hyeon Jun Lee Youngjun Ahn Samuel D. Marks Eric C. Landahl Shihao Zhuang M. Humed Yusuf Matthew Dawber Jun Young Lee Tae Yeon Kim Sanjith Unithrattil Sae Hwan Chun Sunam Kim Intae Eom Sang-Yeon Park Kyung Sook Kim Sooheyong Lee Ji Young Jo Jiamian Hu Paul G. Evans
author_sort	Hyeon Jun Lee
title	Structural Evidence for Ultrafast Polarization Rotation in Ferroelectric/Dielectric Superlattice Nanodomains
title_short	Structural Evidence for Ultrafast Polarization Rotation in Ferroelectric/Dielectric Superlattice Nanodomains
title_full	Structural Evidence for Ultrafast Polarization Rotation in Ferroelectric/Dielectric Superlattice Nanodomains
title_fullStr	Structural Evidence for Ultrafast Polarization Rotation in Ferroelectric/Dielectric Superlattice Nanodomains
title_full_unstemmed	Structural Evidence for Ultrafast Polarization Rotation in Ferroelectric/Dielectric Superlattice Nanodomains
title_sort	structural evidence for ultrafast polarization rotation in ferroelectric/dielectric superlattice nanodomains
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/e576f4a1cf0a4697aca92bac2741c769
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Structural Evidence for Ultrafast Polarization Rotation in Ferroelectric/Dielectric Superlattice Nanodomains

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