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Title: Coupling Magnetism to Electricity in Multiferroic Heterostructures

Complex perovskite oxides exhibit a rich spectrum of functional responses, including magnetism, ferroelectricity, highly correlated electron behavior, superconductivity, etc. The basic materials physmore »ics of such materials provide the ideal playground for interdisciplinary scientific exploration. Over the past decade we have been exploring the science of such materials (for example, colossal magnetoresistance, ferroelectricity, etc) in thin-film form by creating epitaxial heterostructures and nanostructures. Among the large number of materials systems, there exists a small set of materials which exhibit multiple order parameters; these are known as multiferroics. Using our work in the field of ferroelectric and ferromagnetic oxides as the background, we are now exploring such materials as epitaxial thin films, as well as nanostructures. Specifically, we are studying the role of thin-film growth, heteroepitaxy, and processing on the basic properties as well as the magnitude of the coupling between the order parameters. In our work we are exploring the switchability of the antiferromagnetic order using this coupling. What is the importance of this work? Antiferromagnets are pervasive in the recording industry. They are used as exchange biasing layers in magnetic tunnel junctions, etc. However, to date there has been no antiferomagnet that is electrically tunable. We believe that the multiferroic BiFeO3 is one compound where this can be observed at room temperature. The next step is to explore the coupling of a ferromagnet to this antiferromagnet through the exchange biasing concept. Ultimately, this will give us the opportunity to switch the magnetic state in a ferromagnet (and therefore the spin polarization direction) by simply applying an electric field to the underlying antiferromagnetic ferroelectric. In this talk, I will describe our progress to date on this exciting possibility.« less
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Title: Coupling Magnetism to Electricity in Multiferroic Heterostructures
Authors:
Publication Date: 2012-02-15
OSTI Identifier: 1042471
DOE Contract Number: DE-ACO2-06CH11357
Resource Type: Multimedia
Resource Relation: Conference: APS Colloquium Series, Advanced Photon Source (APS) at Argonne National Laboratory, Argonne, Illinois (United States), presented on February 15, 2012
Research Org: ANL (Argonne National Laboratory (ANL), Argonne, IL (United States))
Sponsoring Org: USDOE Office of Science (SC)
Subject: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; ANTIFERROMAGNETIC MATERIALS ; CHARGE CARRIERS ; CHARGE DENSITY ; COPPER COMPOUNDS ; COPPER IONS ; CUPRATES ; DIFFRACTION ; DOMAIN STRUCTURE ; DOPED MATERIALS ; ELECTRONIC STRUCTURE ; LAYERS ; KINETIC ENERGY ; OXIDES ; SEGREGATION ; SPIN ; SUPERCONDUCTIVITY ; HIGH-TC SUPERCONDUCTORS ; Magnetism ; Electricity ; Multiferroic Heterostructures
Country of Publication: United States
Language: English
Run Time: 0:54:23
System Entry Date: 2016-01-28