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Spin-dependent on-site electron correlations and localization in itinerant ferromagnets
R Gotter1, G Fratesi, R A Bartynski
1CNR, Istituto Officina dei Materiali, Basovizza-Trieste, Italy.
Physical Review Letters
|September 26, 2012
Summary
Spin selectivity in angle-resolved Auger photoelectron coincidence spectroscopy (AR-APECS) reveals strong electron correlation effects in ferromagnetic Fe/Cu(001) thin films. This phenomenon is linked to interactions within the majority spin subband, providing insights into electron behavior in magnetic materials.
Area of Science:
- Condensed Matter Physics
- Surface Science
- Materials Science
Background:
- Electron correlation significantly influences the properties of ferromagnetic materials.
- Angle-resolved Auger photoelectron coincidence spectroscopy (AR-APECS) offers a powerful method to investigate spin-dependent electronic structures.
- Understanding electron correlation in thin films is crucial for developing advanced magnetic devices.
Purpose of the Study:
- To investigate spin selectivity in AR-APECS for probing electron correlation in ferromagnetic thin films.
- To analyze the Fe M(2,3)VV Auger line shape in Fe/Cu(001) thin films.
- To identify the role of spin states in Auger electron emission events.
Main Methods:
- Utilizing spin-selective angle-resolved Auger photoelectron coincidence spectroscopy (AR-APECS).
- Measuring Fe M(2,3)VV Auger line shapes in coincidence with Fe 3p photoelectrons.
- Employing a theoretical model combining spin-polarized density functional theory and the Cini-Sawatzky approach.
Main Results:
- A strong electron correlation effect was detected in the Fe M(2,3)VV Auger line shape of Fe/Cu(001) thin films.
- AR-APECS successfully discriminated Auger electron emission based on valence hole pair spin states (high vs. low).
- The observed correlation effect was attributed to interactions within the majority spin subband.
Conclusions:
- Spin-selective AR-APECS is effective for studying electron correlation in ferromagnetic thin films.
- Electron correlation effects in Fe/Cu(001) are strongly influenced by the majority spin subband.
- The findings validate the combined theoretical approach for modeling spin-dependent Auger processes.
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