用于EMCD实验的倒易和实空间映射
Reciprocal and real space maps for EMCD experiments
摘要：
电子磁手征二向色性（EMCD）是利用透射电子显微镜（TEM）定量测量磁性的新兴工具，具有纳米分辨率的可能性。几何条件，数据处理和电子枪设置被发现影响EMCD信号。在这篇文章中，特别注意获得一个可靠的定量测量的比率的轨道自旋磁矩使用能量过滤衍射图案。为此，我们描述了一种数据处理、归一化和镜轴选择的方法。实验结果得到了基于动态衍射和密度泛函理论的理论模拟的支持。电子枪的特殊设置，即所谓的远距聚焦模式，能够实现更高的电子束强度，以及减少伪影对信号的影响。使用这些设置，我们展示了获取EMCD信号的真实空间映射的原理。这使得磁性材料的先进表征具有卓越的空间分辨率。
英文摘要：
Electron magnetic chiral dichroism (EMCD) is an emerging tool for quantitative measurements of magnetic properties using the transmission electron microscope (TEM), with the possibility of nanometer resolution. The geometrical conditions, data treatment and electron gun settings are found to influence the EMCD signal. In this article, particular care is taken to obtain a reliable quantitative measurement of the ratio of orbital to spin magnetic moment using energy filtered diffraction patterns. For this purpose, we describe a method for data treatment, normalization and selection of mirror axis. The experimental results are supported by theoretical simulations based on dynamical diffraction and density functional theory. Special settings of the electron gun, so called telefocus mode, enable a higher intensity of the electron beam, as well as a reduction of the influence from artifacts on the signal. Using these settings, we demonstrate the principle of acquiring real space maps of the EMCD signal. This enables advanced characterization of magnetic materials with superior spatial resolution.
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