nl9b01878_si_001.pdf (1.2 MB)
Observation of Strong Polarization Enhancement in Ferroelectric Tunnel Junctions
journal contribution
posted on 2019-09-18, 21:14 authored by Linze Li, Xiaoxing Cheng, Thomas Blum, Huaixun Huyan, Yi Zhang, Colin Heikes, Xingxu Yan, Chaitanya Gadre, Toshihiro Aoki, Mingjie Xu, Lin Xie, Zijian Hong, Carolina Adamo, Darrell G. Schlom, Long-Qing Chen, Xiaoqing PanFerroelectric heterostructures,
with capability of storing data
at ultrahigh densities, could act as the platform for next-generation
memories. The development of new device paradigms has been hampered
by the long-standing notion of inevitable ferroelectricity suppression
under reduced dimensions. Despite recent experimental observation
of stable polarized states in ferroelectric ultrathin films, the out-of-plane
polarization components in these films are strongly attenuated compared
to thicker films, implying a degradation of device performance in
electronic miniaturization processes. Here, in a model system of BiFeO3/La0.7Sr0.3MnO3, we report
observation of a dramatic out-of-plane polarization enhancement that
occurs with decreasing film thickness. Our electron microscopy analysis
coupled with phase-field simulations reveals a polarization-enhancement
mechanism that is dominated by the accumulation of oxygen vacancies
at interfacial layers. The results shed light on the interplay between
polarization and defects in nanoscale ferroelectrics and suggest a
route to enhance functionality in oxide devices.
History
Usage metrics
Categories
Keywords
out-of-plane polarization componentsnext-generation memoriesdevice performanceFerroelectric Tunnel Junctions Ferroelectric heterostructuresoxide deviceselectron microscopy analysisout-of-plane polarization enhancementultrathin filmsfilm thicknessphase-field simulationsnanoscale ferroelectricsdevice paradigmsferroelectricity suppressionminiaturization processesultrahigh densitiesoxygen vacanciespolarization-enhancement mechanismStrong Polarization Enhancementreport observationmodel system
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC