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Spin polarisation with electron Bessel beams.

P Schattschneider1, V Grillo2, D Aubry3

  • 1Institut für Festkörperphysik, Technische Universität Wien, A-1040 Wien, Austria; USTEM, Technische Universität Wien, A-1040 Wien, Austria.

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Summary
This summary is machine-generated.

Electron microscopes can act as spin polarizers using Bessel beams. While polarization decreases with detector size, it remains high at extremely low voltages, offering a new spin filter option.

Keywords:
CoherenceSpin-orbit coupling

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Area of Science:

  • Physics
  • Materials Science
  • Electron Microscopy

Background:

  • Electron spin polarization is crucial for advanced microscopy techniques.
  • Existing spin polarizers, like Mott detectors, have limitations.
  • Integrating spin polarization directly into electron microscopes is desirable.

Purpose of the Study:

  • To theoretically investigate the potential of using a standard electron microscope as a spin polarizer.
  • To analyze the spin polarization characteristics of a Bessel beam passing through a magnetic objective lens.
  • To evaluate the feasibility of developing new spin filters based on electron microscopy.

Main Methods:

  • Theoretical analysis of electron spin polarization.
  • Simulation of a Bessel beam interacting with a magnetic objective lens.
  • Post-selection of the beam on-axis with varying detector sizes.
  • Calculation of the Figure of Merit for spin polarization.

Main Results:

  • A Bessel beam passing through a standard magnetic objective lens exhibits intrinsic spin polarization when post-selected on-axis.
  • Theoretical spin polarization approaches 100% in the limit of infinitely small detectors.
  • Polarization drops significantly with increasing detector size, falling below 10-4 for medium voltage microscopes.
  • The Figure of Merit improves by two orders of magnitude at extremely low voltages, comparable to Mott detectors.

Conclusions:

  • Electron microscopes can be theoretically utilized as spin polarizers.
  • Low-voltage operation significantly enhances the performance of this spin polarization method.
  • This presents a promising avenue for developing integrated spin filters for electron microscopy.