Convergent-beam EMCD: benefits, pitfalls and applications

Löffler, S.; Hetaba, Walid

doi:10.1093/jmicro/dfx129

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Convergent-beam EMCD: benefits, pitfalls and applications

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Hetaba, Walid
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Löffler, S., & Hetaba, W. (2018). Convergent-beam EMCD: benefits, pitfalls and applications. Microscopy, 67(S1), i60-i71. doi:10.1093/jmicro/dfx129.

Cite as: https://hdl.handle.net/21.11116/0000-0001-2610-2

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.