Structural Modification and Domain Structure in a BaTiO3 Film on (110) SrTiO3
Structural Modification and Domain Structure in a BaTiO3 Film on (110) SrTiO3
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DOI：
10.7567/apex.6.015803
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发表时间：
2013
影响因子：
2.3
通讯作者：
Takao Shimizu;Dai Suwama;H. Taniguchi;T. Taniyama;M. Itoh
中科院分区：
文献类型：
--
作者：
Takao Shimizu;Dai Suwama;H. Taniguchi;T. Taniyama;M. Itoh
用脉冲激光沉积法在(110)SrTiO(STO)衬底上生长了BaTiO(BTO)外延薄膜，发现了一种非传统的准四方晶体结构。BTO薄膜的晶体结构明显不同于块体的四方结构，其主轴短于另一主轴。准四方结构是由于沿[001]和[110]方向的应变松弛不同而产生的近单轴应变所致。用压电响应力显微镜(PFM)观察到的一种不规则的90°磁畴结构，是基于准四方晶体结构中磁畴边界可能存在的小弹性应变而被理解的。
An unconventional pseudo tetragonal crystal structure is demonstrated in a BaTiO3 (BTO) epitaxial thin film grown on a (110) SrTiO3 (STO) substrate by pulsed laser deposition. The crystal structure of the BTO film, one of whose principal axes is shorter than the other, is markedly different from the bulk tetragonal structure. The pseudo tetragonal structure would be caused by the nearly uniaxial strain due to the different strain relaxation along the [001] and [110] axes. An irregular 90° domain structure observed by piezo response force microscopy (PFM) is understood on the basis of a possible small elastic strain at the domain boundary in the pseudo tetragonal crystal structure.