Enhanced fatigue and ferroelectric properties in multiferroic (Ba 0.7Sr0.3)TiO3/(Bi1.05La 0.05)FeO3 epitaxial heterostructures
Document Type
Article
Publication Date
1-1-2013
Abstract
Fatigue and ferroelectric properties of multiferroic (Ba 0.7Sr0.3)TiO3/(Bi1.05La 0.05)FeO3 (BST/BLF) epitaxial heterostructures are studied and compared to those of BLF single-layer films. Our studies show that oxygen vacancies V O • • are the most likely mobile defects in bilayers, whereas defect dipole complexes (F e F e 3 + ′ - V O • •) dominate the single-layer film. However, the fatigue mechanism in both structures is mainly governed by the migration of V O • •. The presence of BST layer in the bilayer increases the energy barrier for the migration of V O • • and decreases the concentration of V O • •. The BST/BLF bilayer reveals an improved fatigue and ferroelectric properties, suggesting a step towards realizing nonvolatile memory applications. © 2013 AIP Publishing LLC.
Keywords
Defect dipoles, Epitaxial heterostructures, Fatigue mechanism, Ferroelectric property, Most likely, Multiferroics, Non-volatile memory application, Single layer films, Epitaxial films, Epitaxial growth, Ferroelectricity, Iron oxides, Ferroelectric films
Divisions
PHYSICS
Publication Title
Applied Physics Letters
Volume
102
Issue
23
Publisher
AIP Publishing
Additional Information
Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA