arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.14569cond-mat.str-el
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拓扑磁性和出射电磁场的自旋云纹工程

Spin moiré engineering of topological magnetism and emergent electromagnetic fields

Kotaro Shimizu, Shun Okumura, Yasuyuki Kato, Yukitoshi Motome

摘要:

自旋螺旋的叠加可以产生拓扑自旋纹理,例如skyrmion和hedgehog晶格。基于与光学中莫尔条纹的类比,我们通过连续调制干涉图案,全面研究了此类叠加的磁性和拓扑性质。我们发现,重叠的螺旋和净磁化强度之间的角度的控制产生连续的拓扑转变与对湮灭的刺猬和antihedgehog。因此,从非共面自旋织构中产生的电磁场、磁单极子和反单极子以及狄拉克弦都表现出系统的演化。此外,我们还展示了该系统如何经历从三维刺猬晶格到二维Skyrmion晶格或一维圆锥态的降维磁跃迁。结果表明,“自旋云纹”的概念为研究磁体的电磁场和拓扑性质提供了一种有效的方法。

英文摘要:

A superposition of spin helices can yield topological spin textures, such as skyrmion and hedgehog lattices. Based on the analogy with the moiré in optics, we study the magnetic and topological properties of such superpositions in a comprehensive way by modulating the interference pattern continuously. We find that the control of the angles between the superposed helices and the net magnetization yields successive topological transitions associated with pair annihilation of hedgehogs and antihedgehogs. Accordingly, emergent electromagnetic fields, magnetic monopoles and antimonopoles, and Dirac strings arising from the noncoplanar spin textures show systematic evolution. In addition, we also show how the system undergoes the magnetic transitions with dimensional reduction from the three-dimensional hedgehog lattice to a two-dimensional skyrmion lattice or a one-dimensional conical state. The results indicate that the concept of "spin moiré" provides an efficient way of engineering the emergent electromagnetism and topological nature in magnets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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