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Epitaxial BiFeO <sub>3</sub> Multiferroic Thin Film Heterostructures

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

Multiferroics

Ferroelectricity

Materials science

2003

Enhancement of polarization and related properties in heteroepitaxially constrained thin films of the ferroelectromagnet, BiFeO3, 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.

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“Epitaxial BiFeO <sub>3</sub> Multiferroic Thin Film Heterostructures” is a paper by J. Wang Jeffrey B. Neaton Haimei Zheng Nagarajan Valanoor Satishchandra Ogale B. Liu Dwight Viehland V. Vaithyanathan Darrell G. Schlom Umesh V. Waghmare Nicola A. Spaldin Karin M. Rabe Manfred Wuttig R. Ramesh published in 2003. It has an Open Access status of “green”. You can read and download a PDF Full Text of this paper here.