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Spin filtering with Mn-doped Ge-core/Si-shell nanowires
1Department of Physics, Michigan Technological University Houghton MI 49931 USA patir@mtu.edu.
Nanoscale Advances
|September 22, 2022
Summary
Adding manganese (Mn) to germanium-silicon core-shell nanowires creates a room-temperature half-metallic ferromagnet. This material exhibits 100% spin polarization, ideal for advanced spintronics applications.
Area of Science:
- Semiconductor physics
- Materials science
- Spintronics
Background:
- Semiconductor core-shell nanowires are promising for spintronics.
- Substrate effects can hinder performance.
- Integrating spin functionality is crucial for next-generation devices.
Purpose of the Study:
- To investigate the potential of Mn-doped Ge-Si core-shell nanowires.
- To explore their transformation into half-metallic ferromagnets.
- To assess their suitability for spintronic applications.
Main Methods:
- First-principles density functional theory (DFT) calculations.
- Analysis of energy band structures.
- Quantum transport simulations.
Main Results:
- A small amount of Mn doping transforms Ge-Si nanowires into stable room-temperature half-metallic ferromagnets.
- Band structures show semiconducting behavior for one spin and metallic for the other, achieving 100% spin polarization.
- Negligible shifts due to spin-orbit coupling suggest high spin coherence length.
- Quantum transport calculations demonstrate >90% spin-filtering efficiency.
Conclusions:
- Mn-doped Ge-Si core-shell nanowires exhibit excellent spin-selective properties.
- These materials are highly suitable for spintronic devices.
- The proposed material offers a pathway to overcome substrate effects in spintronics.