Direct observation of weakened interface clamping effect enabled ferroelastic domain switching

Li, Mingqiang1,2,3; Wang, Bo4; Liu, Heng-Jui5; Huang, Yen-Lin6; Zhang, Jingmin1; Ma, Xiumei1; Liu, Kaihui3,7,8; Yu, Dapeng1,7,8,9; Chu, Ying-Hao6,10; Chen, Long-Qing4; Gao, Peng1,2,3,7

2019-06

10.1016/j.actamat.2019.04.003

ACTA MATERIALIA   影响因子和分区

1359-6454

1873-2453

Reversible switching of non-180 degrees ferroelastic domains that largely alters the local strain distribution enables many electromechanical, electromagnetic and electroacoustic applications. However, in thin films, the ferroelastic domain walls are usually believed to be immobile because of the interface clamping and/or dislocation pinning. Here, using in situ and aberration-corrected transmission electron microscopy, we directly observe reversible switching of individual 90 degrees domains in dislocation-free PbTiO3 thin films and uncover the weakened interface clamping effect. We find the tetragonality is suppressed to similar to 1.017 while the polarization vectors rotate 45 degrees in the a-domain near the interface. These huge structural distortions at the interface is mainly responsible for the weakened clamping effect and thus the ability to switch ferroelastic domains. The switching is fully reversible (i.e., either electric field or mechanical stress can re-establish the erased domain) regardless of polarization orientation of the c-domain matrix. Phase-field modeling also shows excellent agreement with experimental observations. Our study reveals the mechanism of controllable and reversible ferroelastic domain switching, enabling the design of new actuators, sensors, and electromagnetic devices. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Ferroelastic Domain switching In situ transmission electron microscopy (TEM) Atomic structure Interfaces

SCI ; EI

英语

其他

Ministry of Science and Technology, R.O.C.[MOST 103-2119-M-009-003-MY3]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000470046400018

PERGAMON-ELSEVIER SCIENCE LTD

20191706813723

Crystal atomic structure ; Domain walls ; Electric fields ; Electromagnets ; High resolution transmission electron microscopy ; In situ processing ; Interfaces (materials) ; Lead titanate ; Polarization ; Thin films ; Titanium compounds

Electricity: Basic Concepts and Phenomena:701.1 ; Electric Components:704.1 ; Optical Devices and Systems:741.3 ; Atomic and Molecular Physics:931.3 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Peking Univ, Sch Phys, Electron Microscopy Lab, Beijing 100871, Peoples R China
2.Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
3.Peking Univ, Acad Adv Interdisciplinary Studies, Beijing 100871, Peoples R China
4.Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
5.Natl Chung Hsing Univ, Dept Mat Sci & Engn, Taichung 40227, Taiwan
6.Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan
7.Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China
8.Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
9.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China
10.Acad Sinica, Inst Phys, Taipei 11529, Taiwan

Li, Mingqiang,Wang, Bo,Liu, Heng-Jui,et al. Direct observation of weakened interface clamping effect enabled ferroelastic domain switching[J]. ACTA MATERIALIA,2019,171:184-189.

Li, Mingqiang.,Wang, Bo.,Liu, Heng-Jui.,Huang, Yen-Lin.,Zhang, Jingmin.,...&Gao, Peng.(2019).Direct observation of weakened interface clamping effect enabled ferroelastic domain switching.ACTA MATERIALIA,171,184-189.

Li, Mingqiang,et al."Direct observation of weakened interface clamping effect enabled ferroelastic domain switching".ACTA MATERIALIA 171(2019):184-189.