On ferroelectric domain polarization switching mechanism subject to an external electric field by simulations with the phase-field method  

作　　者：ZHOU GuangZhao WANG YongXin LIU Chong CHEN Zheng 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University

出　　处：《Science China(Technological Sciences)》2013年第5期1129-1138,共10页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51075335,51174168,10902086,and 50875217);the NPU Foundation for Fundamental Research(Grant No.JC201005)

摘　　要：The ferroelectric domain formation(FDF) and polarization switching(FDPS) subjected to an external electric field are simulated using the phase-field(PF) method,and the FDPS mechanism under different external electric fields is discussed.The results show that the FDF is a process of nucleation and growth in ferroelectric without applying any external stress.Four kinds of parallelogram shaped ferroelectric domains are formed at the steady state,in which the 180° anti-phase domains regularly align along the 45° direction and the 90° anti-phase domains regularly distribute like a stepladder.Steady electric fields can rotate domain polarization by 90° and 180°,and force the orientation-favorite domains and the average polarization to grow into larger ones.The greater the steady electric field,the larger the average polarization at the steady state.In ferroelectrics subject to an alternating electric field,domain polarization switches to cause a hysteresis loop and an associated butterfly loop with the alternating electric field.The coercive field and remnant field are enhanced with the increase of the electric field frequency or strength,or with the decrease of temperature.

关 键 词：ferroelectric domain polarization switching external electric field phase-field method 

分 类 号：TM271[一般工业技术—材料科学与工程]