| Project/Area Number |
21K03406
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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 13010:Mathematical physics and fundamental theory of condensed matter physics-related
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| Research Institution | Hiroshima University |
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Principal Investigator |
Leonov Andriy 広島大学, 先進理工系科学研究科(理), 准教授 (30804851)
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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 |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | soliton / skyrmion / hopfion / DMI / chiral magnets / bimeron / Cu2OSeO3 / tilted spiral / A-phase / neutron scattering / cone / spiral / liquid crystals / chirality |
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| Outline of Research at the Start |
The aim of the project is by experimental and theoretical means to introduce different classes of oblique non-axisymmetric skyrmions and elucidate the principles of their meshing into a large diversity of extended three-dimensional skyrmionic networks in chiral magnets and liquid crystals.
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| Outline of Final Research Achievements |
I have investigated the properties of diverse multidimensional solitons, such as hopfions, bimerons, skyrmioniums etc., in chiral magnets and liquid crystals. By combining such mathematical disciplines as homotopy and knot theories as well as the methodology of partial differential equations I addressed such fundamental questions as: what are the allowed transformations between solitons and the source of their internal stability; what new extended phases formed from solitons are possible; how do solitons interact and/or collapse via formation of defects; what types of dynamics in spintronic devices can be realized etc.? Part of the research was done in collaboration with the experimental group of Katia Pappas (Delft, the Netherlands). We focused our attention on the temperature and field dependencies of the tilted spiral and skyrmion states. The results of the research have been published in more than 10 papers.
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| Academic Significance and Societal Importance of the Research Achievements |
(i) I generalized mathematically the classes of chiral solitons; (ii) I revisited and designed experiments on visual observation of skyrmion networks; (iii) I suggested networks of entangled skyrmions as carriers of information in spintronic devices
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