Polarization Rotation in Ultrathin Ferroelectrics Tailored by Interfacial Oxygen Octahedral Coupling

IMR OpenIR

	Polarization Rotation in Ultrathin Ferroelectrics Tailored by Interfacial Oxygen Octahedral Coupling
	Zhang, SR; Guo, XW; Tang, YL; Ma, DS; Zhu, YL; Wang, YJ; Li, S; Han, MJ; Chen, D; Ma, JY; Wu, B; Ma, XL; Ma, XL (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China.; Ma, XL (reprint author), Lanzhou Univ Technol, Sch Mat Sci & Engn, Langongping Rd 287, Lanzhou 730050, Gansu, Peoples R China.
	2018-04-01
发表期刊	ACS NANO
ISSN	1936-0851
卷号	12 期号:4 页码:3681-3688
摘要	Multiple polar states and giant piezoelectric responses could be driven by polarization rotation in ferroelectric films, which have potential functionalities in modern material applications. Although theoretical calculations have predicted polarization rotation in pure PbTiO3 films without domain walls and strains, direct experiment has rarely confirmed such polar states under this condition. Here, we observed that interfacial oxygen octahedral coupling (OOC) can introduce an oxygen octahedral rotation, which induces polarization rotation in single domain PbTiO3 films with negligible strains. We have grown ultrathin PbTiO3 films (3.2 nm) on both SrTiO3 and Nb:SrTiO3 substrates and applied aberration-corrected scanning transmission electron microscopy (STEM) to study the interfacial OOC effect. Atomic mappings unit cell by unit cell demonstrate that polarization rotation occurs in PbTiO3 films on both substrates. The distortion of oxygen octahedra in PbTiO3 is proven by annular bright-field STEM. The critical thickness for this polarization rotation is about 4 nm (10 unit cells), above which polarization rotation disappears. First-principles calculations manifest that the interfacial OOC is responsible for the polarization rotation state. These results may shed light on further understanding the polarization behavior in ultrathin ferroelectrics and be helpful to develop relevant devices as polarization rotation is known to be closely related to superior electromechanical responses.; Multiple polar states and giant piezoelectric responses could be driven by polarization rotation in ferroelectric films, which have potential functionalities in modern material applications. Although theoretical calculations have predicted polarization rotation in pure PbTiO3 films without domain walls and strains, direct experiment has rarely confirmed such polar states under this condition. Here, we observed that interfacial oxygen octahedral coupling (OOC) can introduce an oxygen octahedral rotation, which induces polarization rotation in single domain PbTiO3 films with negligible strains. We have grown ultrathin PbTiO3 films (3.2 nm) on both SrTiO3 and Nb:SrTiO3 substrates and applied aberration-corrected scanning transmission electron microscopy (STEM) to study the interfacial OOC effect. Atomic mappings unit cell by unit cell demonstrate that polarization rotation occurs in PbTiO3 films on both substrates. The distortion of oxygen octahedra in PbTiO3 is proven by annular bright-field STEM. The critical thickness for this polarization rotation is about 4 nm (10 unit cells), above which polarization rotation disappears. First-principles calculations manifest that the interfacial OOC is responsible for the polarization rotation state. These results may shed light on further understanding the polarization behavior in ultrathin ferroelectrics and be helpful to develop relevant devices as polarization rotation is known to be closely related to superior electromechanical responses.
部门归属	[zhang, sirui ; guo, xiangwei ; tang, yunlong ; zhu, yinlian ; wang, yujia ; li, shuang ; han, mengjiao ; chen, dong ; ma, jinyuan ; wu, bo ; ma, xiuliang] chinese acad sci, inst met res, shenyang natl lab mat sci, wenhua rd 72, shenyang 110016, liaoning, peoples r china ; [zhang, sirui ; li, shuang ; han, mengjiao ; ma, jinyuan] univ chinese acad sci, yuquan rd 19, beijing 100049, peoples r china ; [ma, desheng] nankai univ, sch phys, weijin rd 94, tianjin 300071, peoples r china ; [guo, xiangwei ; wu, bo] univ sci & technol china, sch mat sci & engn, hefei 230026, anhui, peoples r china ; [ma, jinyuan ; ma, xiuliang] lanzhou univ technol, sch mat sci & engn, langongping rd 287, lanzhou 730050, gansu, peoples r china
关键词	Electromechanical Response Solid-solution Pbtio3 Films Thin-films Phase Enhancement Crystals Origin Fields Oxides
学科领域	Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
资助者	National Natural Science Foundation of China [51571197, 51501194, 51671194, 51401212, 11627801]; National Basic Research Program of China [2014CB921002]; Key Research Program of Frontier Sciences CAS [QYZDJ-SSW-JSC010]; Youth Innovation Promotion Association CAS [2016177]; National Key Research Program of China [2016YFA0201001]; IMR SYNL-T.S. Ke Research Fellowship [2016177]
收录类别	SCI
语种	英语
WOS记录号	WOS:000431088200065
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/79384
专题	中国科学院金属研究所
通讯作者	Zhu, YL; Ma, XL (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China.; Ma, XL (reprint author), Lanzhou Univ Technol, Sch Mat Sci & Engn, Langongping Rd 287, Lanzhou 730050, Gansu, Peoples R China.
推荐引用方式 GB/T 7714	Zhang, SR,Guo, XW,Tang, YL,et al. Polarization Rotation in Ultrathin Ferroelectrics Tailored by Interfacial Oxygen Octahedral Coupling[J]. ACS NANO,2018,12(4):3681-3688.
APA	Zhang, SR.,Guo, XW.,Tang, YL.,Ma, DS.,Zhu, YL.,...&Ma, XL .(2018).Polarization Rotation in Ultrathin Ferroelectrics Tailored by Interfacial Oxygen Octahedral Coupling.ACS NANO,12(4),3681-3688.
MLA	Zhang, SR,et al."Polarization Rotation in Ultrathin Ferroelectrics Tailored by Interfacial Oxygen Octahedral Coupling".ACS NANO 12.4(2018):3681-3688.