使用图形孔径的带轴上的单通STEM-EMCD：实验和数据处理方法的进展
Single-pass STEM-EMCD on a zone axis using a patterned aperture: progress in experimental and data treatment methods
摘要：
在（扫描）透射电子显微镜（（S）TEM）中使用电子磁圆二色性（EMCD）技术测量具有原子柱分辨率的铁磁材料中的磁矩在理论上是可能的。然而，实验和数据处理的障碍目前阻碍了这一目标的实现。实验上，样品必须倾斜到区域轴方向，产生磁散射强度的复杂分布，并且同一样品区域必须多次扫描，每次扫描都需要亚原子空间配准。此外，电磁兼容性CD信号的微弱性质需要先进的数据处理技术来可靠地检测和量化结果。在这篇手稿中，我们详细介绍了我们的实验和数据处理的进展，实现单通带轴EMCD使用图案化的光圈。首先，我们提供了一个全面的数据采集和分析策略，这个和其他EMCD实验，应缩小到原子分辨率实验。其次，我们证明，在低空间分辨率，有前途的EMCD候选信号可以提取，这些都是敏感的结晶取向和动量转移。
英文摘要：
Measuring magnetic moments in ferromagnetic materials with atomic column resolution is theoretically possible using the electron magnetic circular dichroism (EMCD) technique in a (scanning) transmission electron microscope ((S)TEM). However, experimental and data processing hurdles currently hamper the realization of this goal. Experimentally, the sample must be tilted to a zone-axis orientation, yielding a complex distribution of magnetic scattering intensity, and the same sample region must be scanned multiple times with sub-atomic spatial registration necessary at each pass. Furthermore, the weak nature of the EMCD signal requires advanced data processing techniques to reliably detect and quantify the result. In this manuscript, we detail our experimental and data processing progress towards achieving single-pass zone-axis EMCD using a patterned aperture. First, we provide a comprehensive data acquisition and analysis strategy for this and other EMCD experiments that should scale down to atomic resolution experiments. Second, we demonstrate that, at low spatial resolution, promising EMCD candidate signals can be extracted, and that these are sensitive to both crystallographic orientation and momentum transfer.
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