Spin and current transport in the robust half-metallic magnetc-CoFeGe

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Mechanics

Background:

• Spintronics leverages electron spin for novel electronic devices.
• Half-metallic ferromagnets are crucial for spintronic applications.
• Half-Heusler compounds offer potential for spintronic materials.

Purpose of the Study:

• To investigate the structural, electronic, magnetic, and mechanical properties of the half-Heusler compound CoFeGe.
• To evaluate the suitability of cubic CoFeGe for spintronic applications.
• To assess the robustness of its properties under various conditions.

Main Methods:

• First-principles calculations were employed to study CoFeGe.
• Structural stability, electronic band structure, and spin polarization were analyzed.
• Magnetic properties, including Curie temperature and magnetic moment, were calculated.

Main Results:

• Cubic CoFeGe demonstrates robust 100% spin polarization at the Fermi level, stable under hydrostatic pressure and uni-axial strain.
• Longitudinal current polarization (PL) exceeds 99% and is highly robust.
• Anomalous Hall conductivity and spin Hall conductivity were calculated.
• Curie temperature is approximately 524 K with a magnetic moment of 3μB.
• Mechanical properties indicate ductility and stability with a bulk modulus of ≈154 GPa.

Conclusions:

• Cubic CoFeGe is a robust half-metallic ferromagnet with excellent potential for spintronic applications.
• Its stability under strain and pressure, coupled with desirable electronic and magnetic properties, makes it an attractive candidate.
• The material's mechanical robustness further supports its viability for device fabrication.