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Density-functional theory study of half-metallic heterostructures: interstitial Mn in Si
Hua Wu1, Peter Kratzer, Matthias Scheffler
1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
Physical Review Letters
|May 16, 2007
Summary
Interstitial manganese (Mn(int)) in silicon heterostructures creates half-metallic materials with high spin polarization. This discovery offers new possibilities for silicon-based spintronics.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Silicon (Si)-based materials are crucial for electronics.
- Developing Si-based spintronics requires materials with tunable magnetic properties.
- Previous research focused on substitutional dopants, with limited success for magnetic tuning.
Purpose of the Study:
- To investigate the potential of interstitial manganese (Mn(int)) doping in Si heterostructures.
- To determine the magnetic and electronic properties of these novel heterostructures.
- To assess the stability of Mn(int)-doped Si heterostructures compared to substitutional doping.
Main Methods:
- Density-functional theory (DFT) calculations.
- Generalized gradient approximation (GGA) for electronic structure.
- Analysis of band gaps and spin polarization.
Main Results:
- Si heterostructures with 1/4 layer delta-doped Mn(int) exhibit half-metallic properties.
- Higher Mn(int) concentrations (1/2 or 1 layer) yield significant spin polarization (85% and 60%).
- Mn(int)-doped heterostructures are more stable than previously studied substitutional Mn delta layers.
Conclusions:
- Interstitial Mn doping is a viable method to engineer magnetic properties in silicon.
- This approach offers a new pathway for developing advanced Si-based spintronics materials.
- The findings challenge previous assumptions about Mn doping in silicon.
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