2021 Fiscal Year Final Research Report
Simultaneous observation of magnetic domain dynamics and spin-motive force generation using time-resolved magneto-optical microscopy
| Project/Area Number |
19K03757
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
Ogasawara Takeshi 国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 主任研究員 (00392598)
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| Co-Investigator(Kenkyū-buntansha) |
山口 明啓 兵庫県立大学, 高度産業科学技術研究所, 准教授 (70423035)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 磁気イメージング / 磁化ダイナミクス / 時間分解磁気光学顕微鏡 |
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| Outline of Final Research Achievements |
Based on the high-resolution magneto-optical microscope developed before the start of this research, we have constructed a time-resolved magneto-optical microscope using a pulsed semiconductor laser as an illumination source. Compared to conventional time-resolved magneto-optical microscopes, the new system has not only higher resolution but also enables simultaneous measurement of the three components of the magnetization vector, and is more stable and flexible in measurement.
We have succeeded in applying a high-frequency magnetic field of several tens of MHz to a permalloy thin-film rectangular structure of several micrometers per side, and observed the gyration of magnetic vortex using the above apparatus. The use of a semiconductor laser light source made it possible to measure the excitation frequency dependence of the magnetic domain dynamics and to observe the resonance of the swirling motion of the magnetic vortex.
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| Free Research Field |
物性物理学
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| Academic Significance and Societal Importance of the Research Achievements |
高性能の時間分解磁気光学顕微鏡装置を開発した。時間分解磁気イメージングはスピントロニクスやマイクロ磁気工学の分野において欠くことのできない測定技術であるが、放射光などの特別な施設が必要であったり測定に熟練が必要であるなど、使いやすい技術ではなかった。本研究で開発した時間分解磁気光学顕微鏡は、従来にくらべ空間分解能が高いだけでなく、磁化のベクトル観察が可能であり、安定で操作性もよいものとなった。本測定手法が普及すれば、今後のこの分野の研究開発を大きく促進できるものと考える。
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