Giant Polarization Sustainability in Ultrathin Ferroelectric Films Stabilized by Charge Transfer

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	Giant Polarization Sustainability in Ultrathin Ferroelectric Films Stabilized by Charge Transfer
	Zhang, Sirui; Zhu, Yinlian; Tang, Yunlong; Liu, Ying; Li, Shuang; Han, Mengjiao; Ma, Jinyuan; Wu, Bo; Chen, Zuhuang; Saremi, Sahar
刊名	WILEY-V C H VERLAG GMBH
	2017-12-13
卷号	29 期号:46 页码:-
关键词	Ferroelectric Films Interface Pbtio3 Polarization Enhancement Scanning Transmission Electron Microscopy (Stem)
ISSN号	0935-9648
英文摘要	Ferroelectricity is generally deteriorated or even vanishes when the ferroelectric films are downsized to unit cell scale. To maintain and enhance the polarization in nanoscale ferroelectrics are of scientific and technological importance. Here, giant polarization sustainability is reported in a series of ultrathin PbTiO3 films scaled down to three unit cells grown on NdGaO3(110) substrates with La0.7Sr0.3MnO3 as bottom electrodes. Atomic mappings via aberration-corrected scanning transmission electron microscopy demonstrate the robust ferroelectricity for the sub-10 nm thick film. For the 1.2 nm thick film, the polarization reaches approximate to 50 mu C cm(-2). The 2 nm thick film possesses a polarization as high as the bulk value. The films ranging from 10 to 35 nm display a giant elongation of out-of-plane lattice parameter, which corresponds to a polarization of 100 mu C cm-2, 20% larger than that of the bulk PbTiO3. The giant enhancement of polarization in the present films is proposed to result from the charge transfer at the La0.7Sr0.3MnO3/PbTiO3 interface, as supported by the anomalous decrease of Mn valence measured from X-ray photoelectron spectroscopy. These results reveal the significant role of charge transfer at interfaces in improving large polarizations in ultrathin ferroelectrics and are meaningful for the development of future electronic devices.; Ferroelectricity is generally deteriorated or even vanishes when the ferroelectric films are downsized to unit cell scale. To maintain and enhance the polarization in nanoscale ferroelectrics are of scientific and technological importance. Here, giant polarization sustainability is reported in a series of ultrathin PbTiO3 films scaled down to three unit cells grown on NdGaO3(110) substrates with La0.7Sr0.3MnO3 as bottom electrodes. Atomic mappings via aberration-corrected scanning transmission electron microscopy demonstrate the robust ferroelectricity for the sub-10 nm thick film. For the 1.2 nm thick film, the polarization reaches approximate to 50 mu C cm(-2). The 2 nm thick film possesses a polarization as high as the bulk value. The films ranging from 10 to 35 nm display a giant elongation of out-of-plane lattice parameter, which corresponds to a polarization of 100 mu C cm-2, 20% larger than that of the bulk PbTiO3. The giant enhancement of polarization in the present films is proposed to result from the charge transfer at the La0.7Sr0.3MnO3/PbTiO3 interface, as supported by the anomalous decrease of Mn valence measured from X-ray photoelectron spectroscopy. These results reveal the significant role of charge transfer at interfaces in improving large polarizations in ultrathin ferroelectrics and are meaningful for the development of future electronic devices.
学科主题	Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
语种	英语
资助机构	National Natural Science Foundation of China [51231007, 51571197, 51501194, 51671194, 51401212]; National Basic Research Program of China [2014CB921002]; Key Research Program of Frontier Sciences CAS [QYZDJ-SSW-JSC010]; IMR SYNL-T.S. Ke Research Fellowship; Youth Innovation Promotion Association CAS [2016177]
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/78936]
专题	金属研究所_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, Sirui,Zhu, Yinlian,Tang, Yunlong,et al. Giant Polarization Sustainability in Ultrathin Ferroelectric Films Stabilized by Charge Transfer[J]. WILEY-V C H VERLAG GMBH,2017,29(46):-.
APA	Zhang, Sirui.,Zhu, Yinlian.,Tang, Yunlong.,Liu, Ying.,Li, Shuang.,...&Ma, XL .(2017).Giant Polarization Sustainability in Ultrathin Ferroelectric Films Stabilized by Charge Transfer.WILEY-V C H VERLAG GMBH,29(46),-.
MLA	Zhang, Sirui,et al."Giant Polarization Sustainability in Ultrathin Ferroelectric Films Stabilized by Charge Transfer".WILEY-V C H VERLAG GMBH 29.46(2017):-.