A planar Fe₂B monolayer with room temperature antiferromagnetism

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Designing 2D materials with high-temperature antiferromagnetism is key for advanced spintronic devices.
• Room-temperature magnetic materials are essential for next-generation nano-scale technologies.

Purpose of the Study:

• To propose and investigate a novel 2D material, the Fe2B monolayer, for spintronic applications.
• To explore the magnetic and stability properties of the Fe2B monolayer.

Main Methods:

• Utilized first-principles calculations and swarm-intelligence structural prediction.
• Employed Monte Carlo simulations to estimate the Néel temperature.
• Investigated the effects of biaxial strain on magnetic properties.

Main Results:

• Predicted the Fe2B monolayer to be kinetically, thermally, thermodynamically, and mechanically stable.
• Observed strong intrinsic antiferromagnetism due to superexchange and direct exchange interactions.
• Estimated a high Néel temperature of 608 K, well above room temperature.
• Demonstrated preservation of antiferromagnetism and easy magnetization axis under biaxial strain (-5% to +5%).

Conclusions:

• The Fe2B monolayer is a promising candidate for high-performance, strain-tolerant spintronic devices.
• This discovery provides valuable insights for the development of nanoscale magnetic materials.