Controllable defect-induced room temperature ferromagnetism in single-layered titanium oxide nanosheets.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials offer unique electronic and magnetic properties.
• Titanium oxide nanosheets are synthesized via chemical exfoliation.
• Defect engineering is a key strategy for tuning material properties.

Purpose of the Study:

• To investigate defect-induced ferromagnetism in titanium oxide nanosheets.
• To explore the control of ferromagnetism through defect manipulation.
• To assess the potential of these materials for spintronics applications.

Main Methods:

• Chemical exfoliation of layered titanate to obtain single-layered nanosheets.
• Magnetization measurements at room temperature.
• Ar+ ion irradiation to introduce controlled defects.
• Electron diffraction, X-ray photoemission spectroscopy (XPS), and X-ray absorption near edge structure (XANES) for structural and electronic analysis.

Main Results:

• Single-layered titanium oxide nanosheets exhibit room-temperature ferromagnetism attributed to native defects.
• Ferromagnetism can be controllably enhanced by Ar+ ion irradiation.
• Saturation magnetization varies non-monotonically with ion fluence.
• Structural integrity is maintained under mild irradiation; electronic structure is modified.

Conclusions:

• Stable and controllable room-temperature ferromagnetism is achieved in ultra-thin titanium oxide nanosheets.
• Defect engineering provides a pathway for tuning magnetic properties.
• These 2D oxide materials are promising candidates for future spintronics devices.