Journal Article

Emergence of room-temperature ferroelectricity at reduced dimensions

Eom, C. B., Ryu, S., Mikheev, E., Chen, L.-Q., Gruverman, A., Song, K., Stemmer, S., Tenne, D. A., Li, S.-D., Tsymbal, E. Y., Lee, S., Oh, S. H., Wu, X., Lu, H., Choi, S.-Y., Gu, Y., Lee, D., Paudel, T. R.

2015

Overview

The enhancement of the functional properties of materials at reduced dimensions is crucial for continuous advancements in nanoelectronic applications. Here, we report that the scale reduction leads to the emergence of an important functional property, ferroelectricity, challenging the long-standing notion that ferroelectricity is inevitably suppressed at the scale of a few nanometers. A combination of theoretical calculations, electrical measurements, and structural analyses provides evidence of room-temperature ferroelectricity in strain-free epitaxial nanometer-thick films of otherwise nonferroelectric strontium titanate (SrTiO3). We show that electrically induced alignment of naturally existing polar nanoregions is responsible for the appearance of a stable net ferroelectric polarization in these films. This finding can be useful for the development of low-dimensional material systems with enhanced functional properties relevant to emerging nanoelectronic devices.

• Publisher: American Association for the Advancement of Science,The American Association for the Advancement of Science,AAAS
• Subject: Alignment / catalysis (heterogeneous), solar (photovoltaic), energy storage (including batteries and capacitors), hydrogen and fuel cells, defects, mechanical behavior, materials and chemistry by design, synthesis (novel materials) / Emergence / Ferroelectric materials / Ferroelectricity / Ferroelectrics / Mathematical analysis / Medical equipment / Nanoscience / Nanostructure / Solvents / Strontium / Strontium titanates / Thin films