Superfine Nanodomain Engineering Unleashing Ferroelectricity in Incipient Ferroelectrics

Area of Science:

• Materials Science
• Condensed Matter Physics
• Solid State Chemistry

Background:

• Incipient ferroelectrics offer potential for novel functional properties.
• Current engineered ferroelectricity in these materials lags behind classic ferroelectrics.

Purpose of the Study:

• To develop a superfine nanodomain engineering strategy for incipient ferroelectrics.
• To achieve robust ferroelectricity in SrTiO3-based films comparable to classic ferroelectrics.

Main Methods:

• Superfine nanodomain engineering strategy applied to SrTiO3-based films.
• Atomic-scale investigations (e.g., TEM, XRD) to analyze nanodomains.
• Theoretical assessments (e.g., DFT) to understand the underlying mechanisms.

Main Results:

• Achieved unprecedentedly strong ferroelectricity in SrTiO3-based films.
• Record remanent polarization of 17.0 μC cm⁻² with an ultrahigh Curie temperature of 973 K.
• Identified high-density superfine nanodomains (3-10 unit cells) as the origin of robust ferroelectricity.

Conclusions:

• The superfine nanodomain strategy significantly enhances ferroelectric properties in incipient ferroelectrics.
• Fe doping creates a deeper Landau energy well, promoting short-range polarization ordering.
• This approach provides a versatile pathway for designing new and superior ferroelectric materials.