| 研究課題/領域番号 |
20F20363
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| 研究機関 | 信州大学 |
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研究代表者 |
劉 小晰 信州大学, 学術研究院工学系, 教授 (10372509)
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| 研究分担者 |
ZHANG XICHAO 信州大学, 工学部, 外国人特別研究員
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| 研究期間 (年度) |
2020-11-13 – 2023-03-31
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| キーワード | Skyrmion / Bimeron / Skyrmion Tube / Skyrmion String / Bimeron String / Spintronics / Logic Gate |
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| 研究実績の概要 |
In FY2021, we have studied the static and dynamic properties of different types of topological spin textures in different magnetic systems, and we have obtained important results that are useful for the development and design of future information-processing applications, such as memories and logic computing gates. We have studied the current-induced dynamics of skyrmion tubes in synthetic antiferromagnetic multilayers using theoretical and simulation approaches, where we found that skyrmion tube dynamics depend on the detailed multilayer structures. For example, we found that a synthetic antiferromagnetic skyrmion tube made of thinner sublayer skyrmions is more stable during its motion, which is an important property for skyrmion-based applications. We also studied the logic gates based skyrmions in a synthetic antiferromagnetic bilayer structure. In addition, we have studied the transcription and logic operations of skyrmions in bilayer cross structures.
In FY2021, we have also performed simulation research on the dynamics of skyrmion strings in frustrated magnetic systems, where we found that a skyrmion string could be transformed to a bimeron string, which is an important feature that could be used for memory storage and logic computing technologies based on different types of topological spin textures.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
In FY2021, we have studied the physical properties of topological spin textures in both two-dimensional and three-dimensional nanostructures. In our original research proposal, the focus is two-dimensional topological spin textures. However, in FY2021 we also carried out research on the three-dimensional topological spin textures, where we find important physical properties that cannot be found in the two-dimensional case. Our powerful workstations allow us to explore both the two-dimensional and three-dimensional topological spin textures, where we found important results that can be guidelines for the design of spintronic applications based on topological spin textures.
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| 今後の研究の推進方策 |
In FY2022, we will continue to study the static and dynamic properties of topological spin textures in different magnetic systems using both experimental and computational methods. We will focus on the properties of topological spin textures that can be used for building spintronic applications. For example, a recent theoretical study suggests that the helicity degree of freedom of a topological skyrmion can be used for building the quantum bit. The manipulation of the skyrmion helicity is thus very important for practical applications. We will study the helicity dynamics of topological skyrmions and find effective ways to control and manipulate the helicity state of topological spin textures. On the other hand, we will also study the dynamic behaviors of topological skyrmions under compression, which is important for us to know how to build an application based on the dynamics of massive skyrmions interacting with each other.
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