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A semi-classical theory of magnetic inelastic scattering in transmission electron energy loss spectroscopy

Mendis, B.G.

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Abstract

The feasibility of detecting magnetic excitations using monochromated electron energy loss spectroscopy in the transmission electron microscope is examined. Inelastic scattering cross-sections are derived using a semi-classical electrodynamic model, and applied to AC magnetic susceptibility measurements and magnon characterization. Consideration is given to electron probes with a magnetic moment, such as vortex beams, where additional inelastic scattering can take place due to the change in magnetic potential energy of the incident electron in a non-uniform magnetic field. This so-called ‘Stern-Gerlach’ energy loss can be used to enhance the strength of the scattering by increasing the orbital angular momentum of the vortex beam, and enables separation of magnetic from non-magnetic (i.e. dielectric) energy losses, thus providing a promising experimental route for detecting magnons. AC magnetic susceptibility measurements are however not feasible using Stern-Gerlach energy losses for a vortex beam.

Citation

Mendis, B. (2021). A semi-classical theory of magnetic inelastic scattering in transmission electron energy loss spectroscopy. Ultramicroscopy, 230, Article 113390. https://doi.org/10.1016/j.ultramic.2021.113390

Journal Article Type Article
Acceptance Date Sep 9, 2021
Online Publication Date Sep 13, 2021
Publication Date 2021-11
Deposit Date Sep 21, 2021
Publicly Available Date Sep 14, 2023
Journal Ultramicroscopy
Print ISSN 0304-3991
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 230
Article Number 113390
DOI https://doi.org/10.1016/j.ultramic.2021.113390
Public URL https://durham-repository.worktribe.com/output/1240318

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