2015 Fiscal Year Final Research Report
Nano-structures for multiferroic devices
| Project/Area Number |
25706022
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Thin film/Surface and interfacial physical properties
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | マルチフェロイック / 酸化物エレクトロニクス / ナノ構造 |
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| Outline of Final Research Achievements |
A new multiferroic material has explored by artificially designing the oxide nanostructures. At first, ferromagnetic La2NiMnO6 thin films were prepared on SrTiO3(001) substrates by using the pulsed laser deposition technique. By inducing the epitaxial strain into this crystal, La2NiMnO6 thin films were revealed to become ferroelectric crystals. The rhombohedral lattice with R-3 stuructures presents the displacement of A-site La ion along the [111]-direction under the tensile strain. Moreover, the nanocomposite multiferroic crystals with magnetic CoFe2O4 and ferroelectric Bi5Ti3FeO15 were prepared by pulsed laser deposition. Pyroelectric measurements revealed that this nanocomposite crystal is polar. SQUID measurements proved that the magnetism of nanocomposites were originated from the formation of CoFe2O4 nanopillers. Magnetocapacitance measurements revealed the multiferroelectricity of nanocomposites of magnetic CoFe2O4 and ferroelectric Bi5Ti3FeO15 crystals.
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| Free Research Field |
酸化物エレクトロニクス
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