Ferroelectricity and Self-Polarization in Ultrathin Relaxor Ferroelectric Films

被引：39

作者：

Miao, Peixian ^{[1
,2
,3
]}

Zhao, Yonggang ^{[1
,2
,3
]}

Luo, Nengneng ^{[4
]}

Zhao, Diyang ^{[1
,2
,3
]}

Chen, Aitian ^{[1
,2
,3
]}

Sun, Zhong ^{[1
,2
,3
]}

Guo, Meiqi ^{[1
,2
,3
]}

Zhu, Meihong ^{[1
,2
,3
]}

Zhang, Huiyun ^{[1
,2
,3
]}

Li, Qiang ^{[4
]}

机构：

[1] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[2] Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

[3] Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China

[4] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China

来源：

SCIENTIFIC REPORTS | 2016年 / 6卷

基金：

美国国家科学基金会;

关键词：

PIEZOELECTRIC BEHAVIOR; FIELD;

D O I：

10.1038/srep19965

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We report ferroelectricity and self-polarization in the (001) oriented ultrathin relaxor ferroelectric PMN-PT films grown on Nb-SrTiO3, SrRuO3 and La0.7Sr0.3MnO3, respectively. Resistance-voltage measurements and AC impedance analysis suggest that at high temperatures Schottky depletion width in a 4 nm thick PMN-PT film deposited on Nb-SrTiO3 is smaller than the film thickness. We propose that Schottky interfacial dipoles make the dipoles of the nanometer-sized polar nanoregions (PNRs) in PMN-PT films grown on Nb-SrTiO3 point downward at high temperatures and lead to the self-polarization at room temperature with the assistance of in-plane compressive strain. This work sheds light on the understanding of epitaxial strain effects on relaxor ferroelectric films and self-polarization mechanism.

引用

页数：9

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