Epitaxial BiFeO 3 Multiferroic Thin Film Heterostructures

Junling Wang; Jeffrey B. Neaton; Haimei Zheng; V. Nagarajan; Satishchandra Ogale; B. Liu; D. Viehland; V. Vaithyanathan; Darrell G. Schlom; Umesh V. Waghmare; Nicola A. Spaldin; Karin M. Rabe; Manfred Wuttig; R. Ramesh

doi:10.1126/science.1080615

Abstract

Enhancement of polarization and related properties in heteroepitaxially constrained thin films of the ferroelectromagnet, BiFeO 3 , is reported. Structure analysis indicates that the crystal structure of film is monoclinic in contrast to bulk, which is rhombohedral. The films display a room-temperature spontaneous polarization (50 to 60 microcoulombs per square centimeter) almost an order of magnitude higher than that of the bulk (6.1 microcoulombs per square centimeter). The observed enhancement is corroborated by first-principles calculations and found to originate from a high sensitivity of the polarization to small changes in lattice parameters. The films also exhibit enhanced thickness-dependent magnetism compared with the bulk. These enhanced and combined functional responses in thin film form present an opportunity to create and implement thin film devices that actively couple the magnetic and ferroelectric order parameters.

Keywords

MultiferroicsFerroelectricityMaterials scienceThin filmMagnetismMonoclinic crystal systemPolarization (electrochemistry)Condensed matter physicsEpitaxyHeterojunctionCurie temperatureLattice constantCrystal structureSquare latticeTrigonal crystal systemOptoelectronicsOpticsFerromagnetismCrystallographyNanotechnologyDiffractionIsing modelChemistryPhysics

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Publication Info

Year: 2003
Type: article
Volume: 299
Issue: 5613
Pages: 1719-1722
Citations: 6029
Access: Closed

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APA Style

                            
                                
                                    Junling Wang, 
                                
                                    Jeffrey B. Neaton, 
                                
                                    Haimei Zheng
                                
                                et al.
                            
                            (2003). 
                            Epitaxial BiFeO <sub>3</sub> Multiferroic Thin Film Heterostructures. 
                            Science
                            , 299
                            (5613)
                            , 1719-1722.
                            https://doi.org/10.1126/science.1080615
                        

Identifiers

DOI: 10.1126/science.1080615