通过使用图案化孔径实现会聚束EMCD测量中的原子分辨率
Enabling atomic resolution in convergent beam EMCD measurements by the use of patterned apertures
摘要：
我们给出了两种类型的实验演示最近提出的通风孔，可用于获取电子磁圆二向色性（EMCD）信号的区域轴取向与高空间分辨率。为了简化实验程序，我们提出了第三种类型的光圈和实验证明使用这种修改后的通风孔的情况下，在衍射图案的多重对称性。为了证明原子分辨率EMCD的可行性，获得了一系列光束会聚角的EMCD信号。获得了高质量的EMCD信号，其会聚角与原子分辨电子探针相对应。
英文摘要：
We give an experimental demonstration of two types of recently proposed ventilator apertures which can be used to acquire electron magnetic circular dichroic (EMCD) signals in zone axis orientation with high spatial resolution. To simplify the experimental procedures, we propose a third type of aperture and experimentally demonstrate the use of this modified ventilator aperture for the case of multiple symmetries in the diffraction patterns. To show the feasibility of the atomic resolution EMCD, EMCD signals are acquired for a range of beam convergence angles. High quality EMCD signals with convergence angles corresponding to atomic resolution electron probes are obtained.
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