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Mechanisms of Skyrmion and Skyrmion Crystal Formation from the Conical Phase.
Nano Letters ( IF 10.8 ) Pub Date : 2020-03-23 , DOI: 10.1021/acs.nanolett.0c00080
Tae-Hoon Kim 1 , Haijun Zhao 1, 2 , Ben Xu 3 , Brandt A Jensen 1 , Alexander H King 1, 4 , Matthew J Kramer 1 , Cewen Nan 3 , Liqin Ke 1 , Lin Zhou 1
Affiliation  

Real-space topological magnetic structures such as skyrmions and merons are promising candidates for information storage and transport. However, the microscopic mechanisms that control their formation and evolution are still unclear. Here, using in situ Lorentz transmission electron microscopy, we demonstrate that skyrmion crystals (SkXs) can nucleate, grow, and evolve from the conical phase in the same ways that real nanocrystals form from vapors or solutions. More intriguingly, individual skyrmions can also “reproduce” by division in a mitosis-like process that allows them to annihilate SkX lattice imperfections, which is not available to crystals made of mass-conserving particles. Combined string method and micromagnetic calculations show that competition between repulsive and attractive interactions between skyrmions governs particle-like SkX growth, but nonconservative SkX growth appears to be defect mediated. Our results provide insights toward manipulating magnetic topological states by applying established crystal growth theory, adapted to account for the new process of skyrmion mitosis.

中文翻译:

圆锥相形成Skyrmion和Skyrmion晶体的机理。

天体和瓜子等现实空间拓扑磁性结构有望成为信息存储和传输的候选者。但是,控制其形成和演化的微观机制仍不清楚。在这里,就地使用通过洛伦兹透射电子显微镜,我们证明了天体离子晶体(SkXs)可以从圆锥形相成核,生长和演化,其方式与从蒸汽或溶液中形成真正的纳米晶体相同。更有趣的是,单个天琴子也可以在有丝分裂样过程中通过分裂“繁殖”,从而使它们消灭SkX晶格缺陷,而这种缺陷不适用于由质量守恒的粒子制成的晶体。组合弦法和微磁计算表明,天敌之间排斥相互作用和吸引力相互作用之间的竞争决定着颗粒状SkX的生长,但非保守性SkX的生长似乎是由缺陷介导的。我们的研究结果为通过应用已建立的晶体生长理论(适用于解决Skyrmion有丝分裂的新过程)提供了操纵磁性拓扑状态的见解。
更新日期:2020-03-23
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