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

Autor: Mendis BG; Department of Physics, Durham University, South Road, Durham DH1 3LE, UK. Electronic address: b.g.mendis@durham.ac.uk.
Jazyk: angličtina
Zdroj: Ultramicroscopy [Ultramicroscopy] 2021 Nov; Vol. 230, pp. 113390. Date of Electronic Publication: 2021 Sep 13.
DOI: 10.1016/j.ultramic.2021.113390
Abstrakt: 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.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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