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EMCD with an electron vortex filter: Limitations and possibilities.

T Schachinger1, S Löffler2, A Steiger-Thirsfeld2

  • 1Institute of Solid State Physics, TU Wien, Wiedner Hauptstraße 8-10, 1040 Wien, Austria; University Service Centre for Transmission Electron Microscopy, TU Wien, Wiedner Hauptstraße 8-10, 1040 Wien, Austria.

Ultramicroscopy
|April 2, 2017
PubMed
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This study explores using a vortex filter to detect spin-polarized electronic transitions, a method that bypasses the precise crystal alignment needed for standard electron energy-loss magnetic chiral dichroism (EMCD). This advance could enable EMCD applications in amorphous magnetic alloys and interface magnetism.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Spectroscopy

Background:

  • Standard electron energy-loss magnetic chiral dichroism (EMCD) requires precise crystal alignment for beam splitting.
  • This limitation restricts EMCD's application to specific crystalline materials.
  • New methods are needed to extend EMCD's utility to a broader range of magnetic materials.

Purpose of the Study:

  • To investigate the feasibility of detecting spin-polarized electronic transitions using a vortex filter.
  • To develop an alternative EMCD approach that does not require precise crystal alignment.
  • To assess the potential of this new method for analyzing amorphous magnetic alloys and interface magnetism.

Main Methods:

  • Theoretical estimation of dichroic signal strength for ferromagnetic Cobalt (Co) at the L2,3-edge using a single atom scattering approach.

Related Experiment Videos

  • Multi-slice simulations to confirm orbital angular momentum (OAM) conservation in amorphous and thin crystalline materials.
  • Analysis of potential artifact sources including spot size, mask tilt, and astigmatism.
  • Assessment of achievable signal-to-noise ratio (SNR) under experimental conditions.

    • Main Results:

    • The vortex filter approach offers a viable alternative to conventional EMCD by eliminating the need for precise crystal alignment.
    • Orbital angular momentum (OAM) conservation was confirmed in amorphous materials and thin crystalline specimens via multi-slice simulations.
    • Theoretical signal strength for Cobalt was estimated, indicating potential for detection.
    • Key experimental artifact sources and their impact on SNR were evaluated.

    Conclusions:

    • The vortex filter method presents a promising pathway for extending electron energy-loss magnetic chiral dichroism (EMCD) applications.
    • This technique is suitable for studying magnetic properties in materials previously inaccessible to EMCD, such as amorphous alloys.
    • Further experimental validation is warranted to fully realize the potential of this novel EMCD approach.