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Vertically ordered magnetic EuTe quantum dots stacks on SnTe matrices

机译:SnTe矩阵上垂直排列的磁性EuTe量子点堆叠

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摘要

Stacked EuTe magnetic quantum dots (QDs) separated by SnTe spacers of increasing thickness were grown and studied using x-ray diffraction (XRD) and electron microscopy. Grazing incidence XRD indicated that the EuTe QDs are under compressive in-plane strain. Both XRD analysis and microscopy images demonstrated that the EuTe QDs are vertically aligned, as a result of the strain field produced by buried QDs. The width of the lateral error distribution in the QDs' vertical alignment from layer to layer decreases for thinner SnTe spacers, corresponding to more stressed SnTe matrices. The system can be, therefore, tuned to explore magnetic interactions between QDs. The results are discussed in the light of previous elastic strain models in anisotropic matrices from the literature.
机译:生长并通过X射线衍射(XRD)和电子显微镜研究了被厚度增加的SnTe间隔物分隔的堆叠EuTe磁性量子点(QD)。掠入射XRD表明EuTe量子点处于压缩面内应变状态。 XRD分析和显微镜图像均表明,由于掩埋QD产生的应变场,EuTe QD垂直对齐。对于更薄的SnTe间隔物,QD垂直排列的横向误差分布宽度逐层减小,这对应于应力更大的SnTe矩阵。因此,可以调整该系统以探索QD之间的磁相互作用。根据文献中先前在各向异性矩阵中的弹性应变模型对结果进行了讨论。

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