Mapping spin-polarised transitions with atomic resolution

Abstract

The coupling between Angstrom-sized electron probes and spin polarised electronic transitions shows that the inelastically scattered probe is in a mixed state containing electron vortices with non-zero orbital angular momentum. These electrons create an asymmetric intensity distribution in energy filtered diffraction patterns, giving access to maps of the magnetic moments with atomic resolution. A feasibility experiment shows evidence of the predicted effect. Potential applications are column-by-column maps of magnetic ordering, and the creation of Angstrom-sized free electrons with orbital angular momentum by inelastic scattering in a thin ferromagnetic foil.

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• Measuring the Orbital Angular Momentum of Electron Beams
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• EMCD with an electron vortex filter: Limitations and possibilities
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• Projectile Transverse Momentum Controls Emission in Electron Vortex Ionization Collisions
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• Single-pass STEM-EMCD on a zone axis using a patterned aperture: progress in experimental and data treatment methods
• Comment on "Quantized Orbital Angular Momentum Transfer and Magnetic Dichroism in the Interaction of Electron Vortices with Matter"
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• Convergent-Beam EMCD: Benefits, Pitfalls, and Applications
• Proposal for measuring magnetism with patterned apertures
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• Sub-Atomic Channeling and Vortex Beams in SrTiO${}_3$
• Generation of high-OAM ultraviolet twisted light for RF-photoinjector applications