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Emergence of room-temperature ferroelectricity at reduced dimensions

Title
Emergence of room-temperature ferroelectricity at reduced dimensions
Authors
CHOI, SI YOUNGD. LeeH. LuY. GuS. -D. LiS. RyuT. R. PaudelK. SongE. MikheevS. LeeS. StemmerD. A. TenneS. H. OhE. TsymbalX. WuL. -Q. ChenA. L. GruvermanC. -B. Eom
Date Issued
Sep-2015
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Abstract
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.
Keywords
THIN-FILMS; ELECTRON-MICROSCOPY; SPIN POLARIZATION; OXIDE INTERFACES; TUNNEL-JUNCTIONS; ENHANCEMENT; SRTIO3; ELECTRORESISTANCE; NANOSCALE; MEMORIES
URI
http://oasis.postech.ac.kr/handle/2014.oak/39338
DOI
10.1126/science.aaa6442
ISSN
0036-8075
Article Type
Article
Citation
SCIENCE, vol. 349, no. 6254, page. 1314 - 1317, 2015-09
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