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DOI | 10.1126/science.aba5555 |
Relativistic kinematics of a magnetic soliton | |
Lucas Caretta; Se-Hyeok Oh; Takian Fakhrul; Dong-Kyu Lee; Byung Hun Lee; Se Kwon Kim; Caroline A. Ross; Kyung-Jin Lee; Geoffrey S. D. Beach | |
2020-12-18 | |
发表期刊 | Science
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出版年 | 2020 |
英文摘要 | Magnetic materials have domains, patches of ordered spins that are separated from one another by boundaries called domain walls. These boundaries can be driven by electrical currents, a phenomenon forming the basis of the so-called racetrack memories. The speed of the domain walls has steadily increased as experimenters have perfected these devices. Caretta et al. now show experimentally that this speed is fundamentally limited (see the Perspective by Daniels and Stiles). Just as no object can travel faster than the speed of light, the speed of the domain walls saturates to a constant determined only by the properties of the magnetic host material. Science , this issue p. [1438][1]; see also p. [1413][2] A tenet of special relativity is that no particle can exceed the speed of light. In certain magnetic materials, the maximum magnon group velocity serves as an analogous relativistic limit for the speed of magnetic solitons. Here, we drive domain walls to this limit in a low-dissipation magnetic insulator using pure spin currents from the spin Hall effect. We achieve record current-driven velocities in excess of 4300 meters per second—within ~10% of the relativistic limit—and we observe key signatures of relativistic motion associated with Lorentz contraction, which leads to velocity saturation. The experimental results are well explained through analytical and atomistic modeling. These observations provide critical insight into the fundamental limits of the dynamics of magnetic solitons and establish a readily accessible experimental framework to study relativistic solitonic physics. [1]: /lookup/doi/10.1126/science.aba5555 [2]: /lookup/doi/10.1126/science.abe3387 |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/308361 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Lucas Caretta,Se-Hyeok Oh,Takian Fakhrul,et al. Relativistic kinematics of a magnetic soliton[J]. Science,2020. |
APA | Lucas Caretta.,Se-Hyeok Oh.,Takian Fakhrul.,Dong-Kyu Lee.,Byung Hun Lee.,...&Geoffrey S. D. Beach.(2020).Relativistic kinematics of a magnetic soliton.Science. |
MLA | Lucas Caretta,et al."Relativistic kinematics of a magnetic soliton".Science (2020). |
条目包含的文件 | 条目无相关文件。 |
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