Ferroelectricity at the Nanoscale: Local Polarization in Oxide Thin Films and Heterostructures

TLDR

Ferroelectric oxides, discovered over 50 years ago, offer switchable polarization ideal for memory and microelectronics, yet progress has been limited by processing challenges and nanoscale dimensions introduce new physical phenomena. Real‑space characterization and manipulation at atomic scales relies on local probes and first‑principles theory. Recent synthesis breakthroughs enable atomic‑precision oxide structures, producing high‑quality ferroelectric films that can be combined with superconductors and magnetic oxides to create multifunctional devices.

Abstract

Ferroelectric oxide materials have offered a tantalizing potential for applications since the discovery of ferroelectric perovskites more than 50 years ago. Their switchable electric polarization is ideal for use in devices for memory storage and integrated microelectronics, but progress has long been hampered by difficulties in materials processing. Recent breakthroughs in the synthesis of complex oxides have brought the field to an entirely new level, in which complex artificial oxide structures can be realized with an atomic-level precision comparable to that well known for semiconductor heterostructures. Not only can the necessary high-quality ferroelectric films now be grown for new device capabilities, but ferroelectrics can be combined with other functional oxides, such as high-temperature superconductors and magnetic oxides, to create multifunctional materials and devices. Moreover, the shrinking of the relevant lengths to the nanoscale produces new physical phenomena. Real-space characterization and manipulation of the structure and properties at atomic scales involves new kinds of local probes and a key role for first-principles theory.