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Atomic-resolution three-dimensional imaging by field ion microscope with machine learning

Research Project

Project/Area Number 20K05325
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 29020:Thin film/surface and interfacial physical properties-related
Research InstitutionMie University

Principal Investigator

Nagai Shigekazu  三重大学, 工学研究科, 准教授 (40577970)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords電界イオン顕微鏡 / 機械学習 / 表面構造観察 / 表面分析 / トモグラフィー / イメージング
Outline of Research at the Start

近年の電子デバイス等の最小線幅はナノメートルの領域に到達し,これらの性能は材料の組成,および原子配列に極めて敏感になる.そのため,物質を3次元的に原子レベルでの詳細な顕微鏡法が要求されるが,原子分解能を有する顕微鏡法は限られている.その1つとして,電界イオン顕微鏡(FIM)は比較的簡便な構造で原子分解能像が得られるが,観察条件の選定および像解釈の困難であることは否めない.本研究では,FIMに最新のデジタル画像解析法と機械学習を実装するとともに,良質なFIM像を学習データとして利用することで,新たな原子分解能トモグラフィー観察手法としての可能性を見出す.

Outline of Final Research Achievements

As a method for analyzing field ion microscope (FIM) images, we developed a system that automatically detects crystal planes using an object detection model and automatically identifies the crystal orientation of a sample using the k-nearest neighbor method. As a result, it was demonstrated that the crystal orientation of a tungsten sample can be identified with an accuracy of more than 80%. A system was constructed to extract the position of each bright spot observed in the FIM image, which reflects the atomic position, from the differential images taken continuously during field evaporation. In addition, we have implemented this system in an existing FIM system for observation, recording, and automatic extraction of atomic positions. We have found the feasibility of applying machine learning to FIM for atomic-resolution tomography microscopy.

Academic Significance and Societal Importance of the Research Achievements

原子分解能を有する電界イオン顕微鏡は比較的簡便な構造で原子分解能像が得られるが,観察条件の選定および像解釈が困難である。本研究で実施したFIMへの最新のデジタル画像解析法と機械学習の適用により,結晶方位,結晶面,および原子位置を自動解析するシステムを構築することができた。この成果は,新たな原子分解能トモグラフィー観察手法としての可能性を示すものである。さらに本システムは簡便かつ安価であり,次世代デバイスの性能向上および特性評価への貢献が期待される。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (7 results)

All 2022 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Identification of Crystalline Orientation of Tungsten Tips by Machine Learning Analysis of Field Ion Micrographs2022

    • Author(s)
      Yamada Mizuki、Okazawa Tadasuke、Nagai Shigekazu、Hata Koichi
    • Journal Title

      e-Journal of Surface Science and Nanotechnology

      Volume: 20 Issue: 1 Pages: 20-24

    • DOI

      10.1380/ejssnt.2022-009

    • ISSN
      1348-0391
    • Year and Date
      2022-03-03
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Automatic extraction of atomic positions observed in field ion micrographs for a tomographic image by machine learning based procedure2022

    • Author(s)
      Yuga Azechi, Hideto Nakai, Mizuki Yamada, Tadasuke Okazawa, and Shigekazu Nagai
    • Organizer
      14th International Symposium on Atomic Level Characterizations for New Materials and Devices '22
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Determination of the orientation of tip in field ion microscope images by machine learning detection of terraces2021

    • Author(s)
      Mizuki Yamada, Tadasuke Okazawa, Shigekazu Nagai and Koichi Hata
    • Organizer
      13th International Symposium on Atomic Level Characterizations '21
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Fabrication of Co/Pt pyramid for spin-polarized electron emission from single atom2021

    • Author(s)
      Haku Uchikoshi, Yuichi Kuwahata, Shigekazu Nagai and Koichi Hata
    • Organizer
      13th International Symposium on Atomic Level Characterizations '21
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 機械学習による電界イオン顕微鏡像の結晶方位の同定2021

    • Author(s)
      山田 瑞貴、岡澤 正将、永井 滋一、畑 浩一
    • Organizer
      2021年表面真空学会学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] 機械学習による電界イオン顕微鏡像における原子位置の自動抽出2021

    • Author(s)
      岡澤正将,山田瑞貴,疇地悠雅,中居栄斗,永井滋一,畑浩一
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] 機械学習を活用した W tip の電界イオン顕微鏡像の解析2021

    • Author(s)
      山田 瑞貴,岡澤 正将,古川 滉大, 永井 滋一,畑 浩一
    • Organizer
      2021年第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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