Jan Rusz, Somnath Bhowmick
Electron vortex beams (EVB), that is electron beams carrying an orbital angular momentum, are a novel development in the field of transmission electron microscopy. Among their possible applications, a recent experiment indicated that they may enable measurements of the electron magnetic circular dichroism (EMCD) with much better signal to noise ratio. In this work we develop a theoretical description of the inelastic scattering of EVB based on a combined multislice/Bloch-waves approach and explore quantitatively the usefulness of EVB for EMCD measurements. We conclude that vortex beams can provide an advantage over an intrinsic method only in an atomic resolution mode on crystalline samples.
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http://arxiv.org/abs/1304.5461
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