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Mapping inelastic intensities in diffraction patterns of magnetic samples using the energy spectrum imaging
B Warot-Fonrose1, F Houdellier, M J Hÿtch
1CEMES-CNRS, Toulouse Cedex 4, France. warot@cemes.fr
Ultramicroscopy
|July 10, 2007
Summary
This study quantifies inelastic intensity distributions for magnetic materials analysis. The energy spectrum imaging technique successfully maps magnetic chiral dichroic signals in magnetite.
Area of Science:
- Electron Microscopy and Spectroscopy
- Materials Science
- Condensed Matter Physics
Background:
- Studying magnetic materials requires precise measurement of inelastic scattering.
- Obtaining sufficient signal for core losses in 3d magnetic materials (700-900 eV) is experimentally challenging.
- The mixed dynamic form factor (MDFF) theory provides a framework for these measurements.
Purpose of the Study:
- To present quantitative measurements of inelastic intensity distributions in diffraction patterns.
- To investigate the application of energy spectrum imaging (ESI) for mapping inelastic signals.
- To measure and compare the magnetic chiral dichroic signal in magnetite with theoretical predictions.
Main Methods:
- Theoretical framework based on the mixed dynamic form factor (MDFF).
- Experimental comparison of parallel diffraction and large-angle convergent-beam electron diffraction (LACBED) configurations.
- Utilization of a spherical aberration corrector and energy spectrum imaging (ESI) for data acquisition.
Main Results:
- Demonstrated the advantage of using a spherical aberration corrector for improved signal.
- Successfully mapped the inelastic signal in a scattering angle and energy loss data cube using ESI.
- Measured the magnetic chiral dichroic signal in a magnetite sample.
Conclusions:
- Quantitative measurement of inelastic intensity distributions is feasible for magnetic material studies.
- ESI is an effective technique for mapping inelastic signals in electron diffraction.
- Experimental results for magnetite show good agreement with MDFF theory.
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