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arXiv 0704.1407cond-mat.mtrl-scicond-mat.str-el
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第一性原理手征二向色性电子显微学理论在三维铁磁体中的应用

First principles theory of chiral dichroism in electron microscopy applied to 3d ferromagnets

Jan Rusz, Stefano Rubino, Peter Schattschneider

摘要:

最近证实了这一点(Schattschneider等人,Nature 441(2006),486),可以用透射电子显微镜(TEM)进行X射线磁性圆二色性(XMCD)实验的模拟。这一新现象被命名为能量损失磁手性二向色性(EMCD)。在这项工作中,我们提出了一个详细的从头计算研究的手征二色性的铁,钴和镍过渡元素。我们讨论了用于模拟的方法与治疗的有效性和准确性,它可以,在原则上,适用于任何给定的晶体标本。计算了二向色信号对样品厚度、探测器位置精度以及会聚角和收集角大小的依赖关系。

英文摘要:

Recently it was demonstrated (Schattschneider et al., Nature 441 (2006), 486), that an analogue of the X-ray magnetic circular dichroism (XMCD) experiment can be performed with the transmission electron microscope (TEM). The new phenomenon has been named energy-loss magnetic chiral dichroism (EMCD). In this work we present a detailed ab initio study of the chiral dichroism in the Fe, Co and Ni transition elements. We discuss the methods used for the simulations together with the validity and accuracy of the treatment, which can, in principle, apply to any given crystalline specimen. The dependence of the dichroic signal on the sample thickness, accuracy of the detector position and the size of convergence and collection angles is calculated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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