First-principles study of the magnetization of oxygen-depleted In(2)O(3)(001) surfaces

Area of Science:

• Condensed matter physics
• Materials science
• Surface science

Background:

• The origin of magnetism in oxide-based diluted magnetic semiconductors remains unclear.
• Indium(III) oxide (In2O3) is a promising semiconductor material.

Purpose of the Study:

• Investigate the origin of ferromagnetism in oxygen-depleted In2O3(001) surfaces.
• Explain the mechanism behind the observed magnetic states.

Main Methods:

• First-principles density functional calculations.
• Analysis using the Stoner model.
• Examination of surface In s-p hybridization orbitals.

Main Results:

• Perfect oxygen-depleted In2O3(001) surfaces are nonmagnetic.
• Surface states exhibit ferromagnetism upon the introduction of vacancies at outward In sites.
• Stoner model and In s-p hybridization explain the induced magnetization.

Conclusions:

• Vacancies on In sites are the source of magnetism in oxygen-depleted In2O3 surfaces.
• The findings provide a theoretical basis for experimental observations of magnetism in In2O3 nanostructures.
• This study clarifies the mechanism of ferromagnetism in defective In2O3.