2013 Fiscal Year Final Research Report
Novel Ferroelectric Properties Induced by Low-Dimensional Nano-Structures and Its Mechanical Control
| Project/Area Number |
23686023
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Kyoto University |
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Principal Investigator |
SHIMADA Takahiro 京都大学, 工学(系)研究科(研究院), 助教 (20534259)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 低次元構造体 / 強誘電体 / ナノスケール / マルチフィジックス特性 / 第一原理解析 |
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| Research Abstract |
In this study, novel ferroelectric properties in low-dimensional nanostructures are analyzed by large-scale quantum-mechanics simulations using parallel computations. A novel vortex-like polarization structure, which is totally different from that of the bulk counterpart, is successfully observed in all nanostructures such as nano-films, nanowires, nanotubes, and nanodots. The properties are found to be strongly dependent on the shape of components. Furthermore, the coupling between this novel ferroelectric properties and mechanica strain, i.e., multi-physics properties, is analyzed. It is revealed that the presence, strength, and numbers of polarization vortices change with respect to the strain. This indicates that there exist remarkable multi-physics properties in low-dimensional ferroelectric nanostructures.
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[Book] Fracture Nanomechanics2011
Author(s)
Takayuki Kitamura, Hiroyuki Hirakata, Takashi Sumigawa, Takahiro Shimada
Total Pages
297
Publisher
Pan Stanford Publishing Pte. Ltd.
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