| Project/Area Number |
21K13889
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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 13030:Magnetism, superconductivity and strongly correlated systems-related
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
Wang Ziqian 国立研究開発法人理化学研究所, 創発物性科学研究センター, 特別研究員 (00898934)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | van der Waals materials / Magnetism / Symmetry / Nonlinear optics / Nonreciprocity / SHG / Domain contrast / vdW antiferromagnet / Magnon-sideband / Symmetry crossover / 2D materials / atomic-layer magnets / opto-spintronics / magneto-optical effects / harmonic generation / ultrafast spin dynamics |
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| Outline of Research at the Start |
In this study, light is used to visualize and manipulate the magnetic domains of emergent magnetic materials with a thickness of only a single or a few atomic layers (atomic-layer magnets), and to investigate the control of their magnetism on an ultrafast time scale.
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| Outline of Final Research Achievements |
Two-dimensional (2D) van der Waals (vdW) magnets are a new class of materials with a layered structure that exhibit magnetism even when they are just a few atoms thick. These materials have unique features compared to conventional magnets, particularly their ability to be stacked into devices with only a few atomic layers. We conducted in-depth research on these 2D magnets, focusing on their structure, symmetry, and optical properties. Our work revealed an unusual atomic-scale structure in their thin layers that leads to unexpected changes in symmetry. We also discovered unique interactions between virtual particles in a 2D magnet, which have not been observed in traditional magnets. Additionally, we developed a method to control optical nonreciprocity, a property where the material responds differently to light when the direction of light propagation is reversed.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、新興の原子層磁性体の構造、対称性、光学特性に関する重要かつ新たな理解をもたらした。学術的には、この研究で得られた新しい知見は光スピントロニクスと低次元磁性の分野での開拓に基盤を提供していた。また、社会的には、この研究で実現した2D磁性体の新しい機能が、次世代の電子、磁気、光デバイスの開発に貢献していた。
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