Development of functionalities with magnetized defects
Project/Area Number |
16K21632
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Physical properties of metals/Metal-base materials
Thin film/Surface and interfacial physical properties
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Research Institution | Kyoto University (2017-2018) Institute of Physical and Chemical Research (2016) |
Principal Investigator |
Niitsu Kodai 京都大学, 工学研究科, 助教 (90733890)
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Project Period (FY) |
2016-04-01 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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Keywords | 磁性欠陥 / 電子線ホログラフィー / 欠陥強磁性 / 転位 / 機能性材料 / 磁性 / 格子欠陥 / 逆位相境界 / 磁壁 / 永久磁石 / 強磁性体 / 逆位相界面 / 界面偏析 / HAADF-STEM / 規則度 / ホイスラー合金 / 欠陥 / 原子分解能 / 金属物性 / 表面・界面 |
Outline of Final Research Achievements |
The purpose of this study is the direct real-space detection of magnetism confined in narrow regions such as dislocations, twins and antiphase boundaries. Besides, it covers to develop novel functionalities by utilizing confined magnetism. Precise determination of magnetic parameters such as magnetic stiffness and magnetic exchange length often requires high quality, large single crystals and well-tailored experiments, which hampers to determine these parameters of various materials. In this study, by using ferromagnetic elements of Fe and Ni, I have developed an easy-to-use method to measure these properties. We can exploit rich information on intrinsic magnetic properties by measuring spin textures within 180-deg magnetic boundaries by means of electron holography.
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Academic Significance and Societal Importance of the Research Achievements |
交換スティフネスや磁気交換長といった磁気物性パラメータは、良質な単結晶による大規模な実験測定が必要なことが多く、このような試料調製、実験環境が構築できない材料についてこれらの情報を得ることは困難であった。このような困難を克服するため、本研究では単純な強磁性体であるFe,Niを用い、磁壁内のスピン構造を観察することで交換長を評価できる手法を確立した。これにより、ごく微量・多結晶・ナノ結晶の磁性体であっても180磁壁内部のスピン構造を電子線ホログラフィーで可視化することにより、交換長をはじめとする磁気物性の評価が可能となった。
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Report
(4 results)
Research Products
(70 results)
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[Journal Article] Magnetic field observations in CoFeB/Ta layers with 0.67-nm resolution by electron holography2017
Author(s)
Toshiaki Tanigaki, Tetsuya Akashi, Akira Sugawara, Katsuya Miura, Jun Hayakawa, Kodai Niitsu, Takeshi Sato, Xiuzhen Yu, Yasuhide Tomioka, Ken Harada, Daisuke Shindo, Yoshinori Tokura, Hiroyuki Shinada
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Journal Title
Scientific Reports
Volume: 7
Issue: 1
Pages: 16598-16598
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Sub-Nanometer-Resolution Magnetic Field Observation Using Aberration-Corrected 1.2-MV Holography Electron Microscope with Pulse Magnetization System2017
Author(s)
Toshiaki Tanigaki, Tetsuya Akashi, Akira Sugawara, Katsuya Miura, Jun Hayakawa, Kodai Niitsu, Takeshi Sato, Xiuzhen Yu, Yasuhide Tomioka, Ken Harada, Daisuke Shindo, Yoshinori Tokura, Hiroyuki Shinada
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Journal Title
Microscopy and Microanalysis
Volume: 23
Issue: S1
Pages: 452-453
DOI
Related Report
Peer Reviewed
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[Journal Article] New trend in electron holography2016
Author(s)
Toshiaki Tanigaki, Ken Harada, Yasukazu Murakami, Kodai Niitsu, Tetsuya Akashi, Yoshio Takahashi, Akira Sugawara, Daisuke Shindo
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Journal Title
Journal of Physics D: Applied Physics
Volume: 49
Issue: 24
Pages: 244001-244001
DOI
Related Report
Peer Reviewed
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[Presentation] Vortex beam phases in real space studied by electron holography2018
Author(s)
Harada, K., Shimada, K., Ono, Y. A., Iwasaki Y., Niitsu, K., and Shindo, D.
Organizer
IMC19
Related Report
Int'l Joint Research
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[Presentation] Which-way interference experiment with asymmetric double slit by 1.2 MV-TEM2018
Author(s)
Harada,K., Akashi, T., Niitsu, K., Shimada, K., Ono, Y. A., Shindo, D., Shinada, H., and Mori, S.
Organizer
IMC19
Related Report
Int'l Joint Research
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[Presentation] High-Resolution Magnetic Field Observation by Aberration Corrected 1.2-MV Holography Electron Microscopy2017
Author(s)
T. Tanigaki, T. Akashi, A. Sugawara, K. Miura, J. Hayakawa, K. Niitsu, T. Sato, X. Yu, Y. Tomioka, K. Harada, D. Shindo, Y. Tokura, H. Shinada
Organizer
日本顕微鏡学会第73回学術講演会
Related Report
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