Unlocking High Coercivity at Room Temperature in Phase Modified MoS₂.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials with room-temperature magnetism are crucial for spintronic devices.
• Combining semiconducting properties with magnetism is a key challenge in developing next-generation electronics.

Purpose of the Study:

• To investigate the room-temperature magnetic properties of the 1T phase of molybdenum disulfide (MoS2).
• To explore the relationship between structural properties and magnetic coercivity in 2D MoS2.

Main Methods:

• Single-step hydrothermal synthesis was employed to prepare MoS2 nanosheets.
• Structural analysis, including X-ray diffraction, was used to determine phase fraction and lattice parameters.
• Magnetic properties, such as coercivity and saturation magnetization, were measured at room temperature.

Main Results:

• Ferromagnetism was observed in 1T-phase MoS2 at room temperature, with a coercivity of approximately 0.3 T.
• The synthesized MoS2 exhibited a relative 1T-phase content up to 77%.
• Lattice expansion and increased interplanar spacing were correlated with higher 1T-phase fraction and enhanced coercivity.

Conclusions:

• The study demonstrates a record high coercivity for 2D magnets at room temperature.
• Phase and strain engineering in MoS2 provide a direct structural pathway to control magnetic coercivity.
• This work presents a scalable platform for developing phase-engineered magnetism in layered materials for spintronics.