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Microstructure and Ferroelectric Characteristics of Ultra-Thin BaTiO3 Films

Published online by Cambridge University Press:  28 July 2011

Y. Drezner  and
S. Berger
Y. Drezner
Affiliation:
Department of Materials Engineering, Technion, Haifa 32000, Israel
S. Berger
Affiliation:
Department of Materials Engineering, Technion, Haifa 32000, Israel
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Abstract

Microstructure studies of ultra-thin BaTiO3 thin films (2-10 nm thick) show nano-domains having a width as small as one unit cell. Only 180° nano-domains are formed in multi-domains structures. The domain-boundaries are formed at {001} twin boundaries. Most of the domains are oriented in parallel to the film plane but out-of-plane orientations are also observed. The films exhibit ferroelectric behavior characterized by a polarization hysteresis loop and a relatively fast switching time. A remnant polarization of about 0.5 μC/cm2 and coercive field of 2.7 V/cm were measured in parallel to the film plane. Temperature-dependent measurements show two peaks of the dielectric constant at about 60°C and 115°C. These peaks are attributed to two transition temperatures associated with the orientation of the nano-domains relative to the film plane and stress.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 811: Symposia D/E – Integration of Advanced Micro-and Nanelectronic Devices-Critical Issues and Solutions , 2004 , D8.8
Copyright
Copyright © Materials Research Society 2004

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