文章信息/Info

Title:

Polarization Fatigue in Ferroelectrics: Fundamentals and Recent Developments

作者:

婁曉杰

（西安交通大學前沿科學技術研究院， 陜西 西安　710054）��

Author(s):

LOU Xiaojie

(Frontier Institute of Science and Technology，Xi’an Jiaotong University， Xi’an 710054， China)

關鍵詞:

極化疲勞; 鐵電材料; 極化翻轉; 尺寸效應; 相分離

DOI:

10.7502/j.issn.1674-3962.2013.06.04

摘要:

簡要回顧了鐵電材料中極化疲勞現象的基本機理和最新進展。詳細地介紹了作者和其合作者最近創立的LPD�睸ICI模型（LPD�睸ICI是指極化翻轉引起的電荷注入導致的局域相分離）。LPD�睸ICI模型認為導致鐵電材料中極化疲勞的主要原因是：在極化翻轉早期形成的針狀疇頂端的非屏蔽束縛電荷在電極－薄膜界面處會導致強烈的電荷注入（主要是電子），引起局域的焦耳熱，最后在疇成核位置引發局域相分離。通過回顧過去幾年在鐵電材料電學極化疲勞方面實驗研究的最新進展，得出LPD�睸ICI模型與過去三年中文獻上發表的大多數實驗觀測相一致，并可以解釋這些現象的起因。因此，極化翻轉導致的局域相分離可能是各種類型鐵電材料極化疲勞的共同起因。��

Abstract:

In this paper， we firstly give a brief review on the fundamentals and recent developments on polarization fatigue in ferroelectric materials. The LPD�睸ICI model (LPD�睸ICI stands for local phase decomposition induced by switching�瞚nduced charge injection) developed by the present author and his colleagues has been introduced and discussed in detail. The main scenario proposed for polarization fatigue in ferroelectrics in the LPD�睸ICI model is that the unscreened bound charge formed at the tip of the needle�瞝ike domain at the very early stage of polarization reversal will induce an intensive charge injection (mostly electrons) near the electrode�瞗ilm interface， and subsequently local Joule heating， and finally local phase decomposition around the domain nucleation site. By reviewing the recent progress on experimental studies of electrical fatigue in a variety of ferroelectric samples in both thin film and bulk form， we show that the LPD�睸ICI model is in good agreement with most of the observations published in the last three years in the literature. Therefore， local phase decomposition induced by switching�瞚nduced charge injection may indeed be the generic reason for polarization fatigue in a variety of ferroelectric materials， and probably antiferroelectric materials as well.��