Misfit Relaxation Mechanisms and Domain Ordering in Anisotropically Strained Manganite Thin Films
Misfit Relaxation Mechanisms and Domain Ordering in Anisotropically Strained Manganite Thin Films
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各向异性应变锰氧化物薄膜中的失配弛豫机制和域有序化
DOI：
10.1021/acsami.0c12296
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发表时间：
2020
影响因子：
9.5
通讯作者：
Wu Wenbin
中科院分区：
文献类型：
--
作者：
Zhang Zixun;Feng Qiyuan;Jin Feng;Yin Zhizhen;Xie Caihong;Xu Liqiang;Zhang Kexuan;Qu Lili;Gao Guanyin;Meng Wenjie;Hou Yubin;Chen Feng;Jin Shaowei;Lu Qingyou;Wu Wenbin
用离镜X射线倒易空间映射方法研究了（LaAlO 3）0.3（SrAl0.5Ta0.5O3）0.7（110）衬底上外延Pr0.5Sr0.5MnO3薄膜的各向异性应变演化。结果表明，随着薄膜厚度的增加，薄膜呈现多级结构演化（类单畴结构、畴有序化、孪晶畴和/或周期性结构调制），并且由于薄膜的单斜畸变，[11 <$0]和[001]两个横向面内方向的结构调制有很大不同.然后我们展示了不同厚度下倒易空间中衍射斑点的分布与真实的空间中相应畴结构之间的关系，这与厚度相关的磁性和磁输运性质密切相关。更重要的是，利用自制的磁力显微镜对畴有序的分布和湮灭动力学进行了成像，揭示了向[001]或[001 <$]方向倾斜的结构畴沿着[11 <$1]和[1 <$11]晶体取向排列。与各向异性应变相关的畴有序的直接可视化和动力学将为强相关钙钛矿氧化物薄膜中畴工程的控制和操纵开辟一条新的途径。
The evolution of anisotropic strain in epitaxial Pr0.5Sr0.5MnO3films grown on (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7(110) substrates has been characterized by off-specular X-ray reciprocal space mappings on the (130), (310), (222), and (222̅) reflections in the scattering zone containing the [110] axis. We demonstrate that a multistage hierarchical structural evolution (single-domain-like structure, domain ordering, twin domains, and/or periodic structural modulations) occurs as the film thickness increases, and the structural modulation between the two transverse in-plane [11̅0] and [001] directions is quite different due to the monoclinic distortion of the film. We then show the relationship between the distribution of diffraction spots in reciprocal space and their corresponding domain configurations in real space under various thicknesses, which is closely correlated with thickness-dependent magnetic and magnetotransport properties. More importantly, the distribution and annihilation dynamics of the domain ordering are imaged utilizing home-built magnetic force microscope, revealing that the structural domains tilted toward either the [001] or [001̅] direction are arranged along the [11̅1] and [1̅11] crystal orientations. The direct visualization and dynamics of anisotropic-strain-related domain ordering will open a new path toward the control and manipulation of domain engineering in strongly correlated perovskite oxide films.