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Reciprocal and real space maps for EMCD experiments

机译：用于EMCD实验的倒数和真实空间图

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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.
机译：电子磁性手性二色性（EMCD）是一种新兴的工具，用于使用透射电子显微镜（TEM）定量测量磁性，并具有纳米分辨率的可能性。发现几何条件，数据处理和电子枪设置会影响EMCD信号。在本文中，要特别注意使用能量过滤的衍射图来获得可靠的定量测量轨道与自旋磁矩之比的方法。为此，我们描述了一种数据处理，归一化和选择镜轴的方法。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（所谓的远距对焦模式）使电子束的强度更高，并减少了伪像对信号的影响。使用这些设置，我们演示了获取EMCD信号的真实空间图的原理。这使得能够以优异的空间分辨率对磁性材料进行高级表征。

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