| 研究課題/領域番号 |
21K03406
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| 研究種目 |
基盤研究(C)
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| 配分区分 | 基金 |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分13010:数理物理および物性基礎関連
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| 研究機関 | 広島大学 |
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研究代表者 |
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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| 研究期間 (年度) |
2021-04-01 – 2024-03-31
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| 研究課題ステータス |
交付 (2022年度)
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| 配分額 *注記 |
4,160千円 (直接経費: 3,200千円、間接経費: 960千円)
2023年度: 1,040千円 (直接経費: 800千円、間接経費: 240千円)
2022年度: 1,170千円 (直接経費: 900千円、間接経費: 270千円)
2021年度: 1,950千円 (直接経費: 1,500千円、間接経費: 450千円)
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| キーワード | skyrmion / tilted spiral / A-phase / chiral magnets / Cu2OSeO3 / neutron scattering / cone / spiral / liquid crystals / chirality |
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| 研究開始時の研究の概要 |
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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| 研究実績の概要 |
I finalized a systematic study of the stability and ordering of low temperature magnetic states in the bulk helimagnet Cu2OSeO3 done in collaboration with the group of Katia Pappas (Delft university, the Netherlands). We focused our attention on the temperature and field dependencies of the tilted spiral state that we observed persisting up to above T=35 K, i.e. up to higher temperatures than reported so far. Since the stability region of the skyrmion phase displays strongly hysteretic behavior for increasing and decreasing magnetic fields, we addressed this important point using micromagnetic simulations and came to the conclusion that skyrmion nucleation is underpinned by the reorientation of oblique spiral domains occurring near the critical magnetic fields of the phase diagrams.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
In spite of the relatively hard world situation due to the pandemic, the project progresses rather smoothly. It was possible to publish 8 papers in high-rank peer-reviewed journals. At the same time, it was impossible to travel abroad. Thus, the collaboration with the experimentalists in Europe and USA became rather slow. Moreover, due to the economic slump, many experimental facilities in Europe function irregularly. Therefore, the experimental part of the project is slightly delayed. On the average, however, the project progresses rather smoothly since the theoretical part progressed faster than expected.
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| 今後の研究の推進方策 |
The project progresses rather smoothly. As for the magnetic part, joint theoretical and experimental results on Cu2OSeO3 demonstrate rather good compliance. The future plans include addressing experimental results in other bulk helimagnets such as MnSi and FeGe.
As for the liquid-crystal part of the project, the theoretical modelling was completely finalized. The remaining point left are the experimental results in thin layers of chiral LCs. Thus, the future plans include explanation of the experiments obtained by the collaborators from the Smalyukh's group. Since presently, we are in the same institute (WPI-SKCM2), there is hope that we finalize this part of the project as well.
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