Carbon p electron ferromagnetism in silicon carbide

Area of Science:

• Condensed Matter Physics
• Materials Science
• Semiconductor Physics

Background:

• Ferromagnetism is observed in wide-band gap semiconductors and carbon-based materials upon defect introduction.
• Establishing a direct link between defects and ferromagnetism is crucial for understanding and controlling magnetic properties.

Purpose of the Study:

• To investigate the microscopic origin of defect-induced ferromagnetism in silicon carbide (SiC).
• To establish a direct relationship between specific defects and the resulting ferromagnetic behavior.

Main Methods:

• Theoretical investigation of defect structures in SiC.
• Analysis of electronic structure and spin interactions.

Main Results:

• Long-range ferromagnetic coupling in SiC is attributed to the p electrons of carbon atoms.
• These carbon atoms are located near VSiVC divacancies.
• The ferromagnetism originates from the electronic configuration around these specific defects.

Conclusions:

• The study successfully traces the origin of ferromagnetism in SiC to its microscopic electronic roots.
• The findings highlight the role of specific divacancies and associated carbon atom electrons in mediating ferromagnetic coupling.