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Quantitative magnetic mapping in TEM through accurate 2D thickness determination.

Joseph Vimal Vas1, Hasan Ali2, Wen Shi1

  • 1Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, Jülich, 52425, Germany.

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Summary
This summary is machine-generated.

Accurate thickness measurements using Electron Energy Loss Spectroscopy (EELS) are crucial for quantitative magnetic mapping with Transmission Electron Microscopy (TEM). This study presents a method to precisely determine the inelastic mean free path (λ) for improved EELS accuracy.

Keywords:
Convergent Beam Electron DiffractionElectron Energy Loss SpectroscopyElectron holographyElectron magnetic circular dichroismFocused ion beam

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Area of Science:

  • Materials Science
  • Physics
  • Electron Microscopy

Background:

  • Off-axis Electron Holography and Electron Magnetic Circular Dichroism (EMCD) offer high spatial resolution magnetic mapping.
  • Current limitations in quantitative magnetic measurements stem from imprecise sample thickness determination.
  • Electron Energy Loss Spectroscopy (EELS) is a promising technique for thickness mapping, but requires accurate inelastic mean free path (λ) estimation.

Purpose of the Study:

  • To develop a straightforward approach for precisely determining the inelastic mean free path (λ).
  • To enable accurate thickness measurements using EELS for quantitative magnetic analysis.
  • To compare EELS-derived thickness measurements with established methods like Convergent Beam Electron Diffraction (CBED) and Scanning Electron Microscopy (SEM).

Main Methods:

  • Determining the inelastic mean free path (λ) for accurate EELS-based thickness measurements.
  • Acquiring EELS maps to assess spatial thickness variations.
  • Comparing EELS thickness data with CBED and SEM measurements, especially for thin samples (<100nm).
  • Applying calibrated thickness measurements to TEM-based magnetic mapping techniques.

Main Results:

  • A straightforward method for precise inelastic mean free path (λ) determination was established.
  • Accurate thickness maps were generated using EELS.
  • Discrepancies were observed between EELS and CBED/SEM thickness measurements, particularly in samples thinner than 100nm.
  • Quantitative magnetic maps were successfully obtained by integrating calibrated EELS thickness data.

Conclusions:

  • Precise determination of the inelastic mean free path (λ) significantly enhances the quantitative capabilities of EELS for thickness measurements.
  • Accurate thickness mapping using EELS is essential for improving the quantification of magnetic information obtained from advanced Transmission Electron Microscopy (TEM) techniques.
  • The developed method provides a pathway to more reliable quantitative magnetic imaging in materials science.