Dynamic evolution and fracture of multilayer field emitters in atom probe tomography: a new interpretation
Dynamic evolution and fracture of multilayer field emitters in atom probe tomography: a new interpretation
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原子探针断层扫描中多层场发射体的动态演化和断裂：新的解释
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
D. Blavette
中科院分区：
文献类型：
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作者：
N. Rolland;F. Vurpillot;S. Duguay;D. Blavette
由于原子探针断层扫描重建基于发射器表面上的离子反投影，因此了解尖端形状的演化动力学对于获得初始样品的准确图像至关重要。在本文中，提出了一种分析方法来动态描述场蒸发过程中复杂多层结构的形态演变。该模型主要建立在共同连续性假设的基础上，除了尖端顶点的经典半球描述之外，它被扩展到更广泛的一类恒定平均曲率旋转曲面，即 Delaunay 曲面。从这种方法获得的结果与标准数值模拟相当，但模型的分析特征可以更深入地了解驱动发射器形态的原理。特别是，提供了从一层过渡到另一层期间曲率演变的完整图片。此外，还突出显示了双层样品中尖端断裂的场蒸发阈值。
Since Atom Probe Tomography reconstruction is based on ion back projection onto the emitter surface, understanding of the evolution dynamics of the tip shape is essential to get an accurate picture of the initial sample. In this article, an analytical approach is presented to dynamically describe the morphology evolution of complex multilayer structures during field evaporation. The model is mostly founded on the common continuity hypothesis, except for the classical hemispherical description of the tip apex, which is extended to a wider class of a constant mean curvature surface of revolution, the Delaunay surfaces. The results obtained from this approach are comparable with standard numerical simulations, but the analytical character of the model gives more insight into the principles driving the emitter morphology. In particular, a complete picture of curvature evolution during the transition from one layer to another is provided. Additionally, a field evaporation threshold for tip fracture in a bilayer sample is highlighted.
影响因子：
2.2
作者：
Gault, B.;Haley, D.;Geiser, B. P.
通讯作者：
Geiser, B. P.