Domain Wall Orientations in Ferroelectric Superlattices Probed with Synchrotron X-Ray Diffraction.

Domain Wall Orientations in Ferroelectric Superlattices Probed with Synchrotron X-Ray Diffraction.
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用同步加速器 X 射线衍射探测铁电超晶格中的畴壁方向。

DOI:
10.1103/physrevlett.120.037602
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发表时间:
2018
影响因子:
8.6
通讯作者:
Hadjimichael M
Hadjimichael M
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Hadjimichael M

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用同步辐射x射线衍射法研究了超晶格中的铁电畴。宏观测量表明,随着温度的升高,择优磁畴壁的取向从晶面向晶面转变。这种重新取向的温度范围取决于铁电层的厚度和磁畴周期。利用纳米聚焦光束,在样品的结构均匀区域和缺陷位置附近以及Ar离子刻蚀图案中,都可以成像埋入的铁电层内的磁化壁取向的局部变化。发现域壁表现出与蚀刻图案的直边以及与缺陷位置相关联的结构特征的优先对准。离面晶格参数的分布被映射到一个这样的特征周围,表明它伴随着不均匀的应变和大的应变梯度。
Ferroelectric domains insuperlattices are studied using synchrotron x-ray diffraction. Macroscopic measurements reveal a change in the preferential domain wall orientation fromtocrystallographic planes with increasing temperature. The temperature range of this reorientation depends on the ferroelectric layer thickness and domain period. Using a nanofocused beam, local changes in the domain wall orientation within the buried ferroelectric layers are imaged, both in structurally uniform regions of the sample and near defect sites and argon ion-etched patterns. Domain walls are found to exhibit a preferential alignment with the straight edges of the etched patterns as well as with structural features associated with defect sites. The distribution of out-of-plane lattice parameters is mapped around one such feature, showing that it is accompanied by inhomogeneous strain and large strain gradients.
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影响因子: 4
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