Room-Temperature Magnetoelectric Coupling in Atomically Thin ε-Fe₂ O₃

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) multiferroics with magnetoelectric coupling are essential for high-density data storage and low-power spintronics.
• Achieving strong interactions between magnetic and electric order parameters at room temperature in 2D materials remains a significant challenge.

Purpose of the Study:

• To synthesize atomically thin, non-layered ε-Fe₂O₃ single crystals.
• To investigate the magnetic and ferroelectric properties of these 2D materials at room temperature.
• To demonstrate and verify room-temperature magnetoelectric coupling in ε-Fe₂O₃.

Main Methods:

• Space-confined chemical vapor deposition (CVD) for synthesizing atomically thin ε-Fe₂O₃.
• Characterization of magnetic order (ferrimagnetism) and electric polarization (ferroelectricity).
• Measurement of magnetoelectric coupling by controlling magnetism with an electric field.

Main Results:

• Successful synthesis of atomically thin, non-layered ε-Fe₂O₃ single crystals.
• Observation of room-temperature long-range ferrimagnetic order and robust ferroelectricity with thickness-dependent coercive voltage.
• Unambiguous demonstration of room-temperature magnetoelectric coupling, confirming the multiferroic nature of ε-Fe₂O₃.

Conclusions:

• Atomically thin ε-Fe₂O₃ exhibits robust room-temperature multiferroic behavior with significant magnetoelectric coupling.
• The developed synthesis strategy overcomes limitations in creating multifunctional 2D materials.
• This work paves the way for low-energy electric-writing/magnetic-reading devices and advanced spintronic applications.