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      Ultrathin oxide films and interfaces for electronics and spintronics

      , ,
      Advances in Physics
      Informa UK Limited

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          Epitaxial BiFeO3 multiferroic thin film heterostructures.

          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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            Exchange bias

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              Multiferroics: a magnetic twist for ferroelectricity.

              Magnetism and ferroelectricity are essential to many forms of current technology, and the quest for multiferroic materials, where these two phenomena are intimately coupled, is of great technological and fundamental importance. Ferroelectricity and magnetism tend to be mutually exclusive and interact weakly with each other when they coexist. The exciting new development is the discovery that even a weak magnetoelectric interaction can lead to spectacular cross-coupling effects when it induces electric polarization in a magnetically ordered state. Such magnetic ferroelectricity, showing an unprecedented sensitivity to ap plied magnetic fields, occurs in 'frustrated magnets' with competing interactions between spins and complex magnetic orders. We summarize key experimental findings and the current theoretical understanding of these phenomena, which have great potential for tuneable multifunctional devices.
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                Author and article information

                Journal
                Advances in Physics
                Advances in Physics
                Informa UK Limited
                0001-8732
                1460-6976
                February 2011
                February 2011
                : 60
                : 1
                : 5-84
                Article
                10.1080/00018732.2010.534865
                f2fbbe8b-ec80-482f-9ac0-1635f6ebd596
                © 2011
                History

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