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Convergent-beam EMCD: benefits, pitfalls and applications.

作者信息

Löffler S, Hetaba W

机构信息

University Service Centre for Transmission Electron Microscopy, TU Wien, Vienna, Austria.

Department for Materials Science and Engineering, McMaster University, Hamilton, Ontario, Canada.

出版信息

Microscopy (Oxf). 2018 Mar 1;67(suppl_1):i60-i71. doi: 10.1093/jmicro/dfx129.

DOI:10.1093/jmicro/dfx129
PMID:29370394
Abstract

Energy-loss magnetic chiral dichroism (EMCD) is a versatile method for studying magnetic properties on the nanoscale. However, the classical EMCD technique is notorious for its low signal-to-noise ratio (SNR), which is why many experimentalists have adopted a convergent-beam approach. Here, we study the theoretical possibilities of using a convergent beam for EMCD. In particular, we study the influence of detector positioning as well as convergence and collection angles on the detectable EMCD signal. In addition, we analyse the expected SNR and give some guidelines for achieving optimal EMCD results.

摘要

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