Electron beam-formed ferromagnetic defects on MoS₂ surface along 1 T phase transition

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Molybdenum disulfide (MoS2) is a layered material with distinct 2H and 1T phases.
• Controlling phase transitions and defects in MoS2 is crucial for tuning its electronic and magnetic properties.

Purpose of the Study:

• To investigate the effects of electron irradiation on the phase and properties of MoS2.
• To explore the potential of electron irradiation for creating ferromagnetic MoS2 for spintronics.

Main Methods:

• Optimal electron irradiation was applied to cleaved MoS2 surfaces.
• Characterization of induced defects, phase transitions, and resulting magnetic and electrical properties.

Main Results:

• Electron irradiation induced a 2H to 1T phase transition, creating defects and vacancies.
• A weak ferromagnetic state was achieved at room temperature.
• Improved transport properties and a reduced bandgap were observed.

Conclusions:

• Electron irradiation is an effective method to control MoS2 phase and properties.
• The induced ferromagnetism and improved conductivity are promising for spintronics and low-dimensional devices.
• The reduced bandgap may help eliminate Schottky barriers.