2020 Fiscal Year Final Research Report
Investigation of interface induced polarization using electron nano-probe
| Project/Area Number |
19K14623
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2021-03-31
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| Keywords | 収束電子回折 / 電子顕微鏡 / 界面誘起強誘電性 / 局所構造解析 / ビームロッキング |
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| Outline of Final Research Achievements |
Improvement of electron density distribution analysis by convergent-beam electron diffraction using a nano-electron probe was conducted. Diffraction patterns with large convergence angle have advantage for precise determination of electron density and the origin was discussed. Crystal zone axis incidence and the data obtained from slight beam tilting condition were used for structural refinement and the difference were investigated.
The twin interface of CaTiO3 was analyzed as an interface-induced polarization structure. From the symmetry change of the convergent-beam electron diffraction pattern at each electron probe position, the breaking of centrosymmetric at the interface was found.
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| Free Research Field |
電子線結晶学
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| Academic Significance and Societal Importance of the Research Achievements |
界面や粒界ではバルクとは異なる物性を示す場合があり，近年のデバイスの小型化に際してその重要性は増している．本研究によりナノ電子プローブを用いた電子密度分布解析手法の高精度化が実現し，今後様々な物質群への応用が行われる．また本研究で初めて界面での収束電子回折図形の取得に成功し，界面誘起強誘電性の解明に確かな一歩を刻むことができた．今後は開発した手法を用いて界面の電子密度分布解析を進め，その起源の解明とその応用へと進展していくことが期待できる．
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