arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1408.4889cond-mat.mes-hall
收藏

畴壁磁振子晶体的磁振子能带结构

Magnonic band structure of domain wall magnonic crystals

D. Wang, Yan Zhou, Zhi-xiong Li, Yaozhuang Nie, Xi-guang Wang, Guang-hua Guo

摘要:

磁振子晶体是设计用于控制自旋波传播的原型磁性超材料。常规的磁振子晶体由单畴元件组成。如果磁化织构,例如畴壁、涡旋和skyrmions,被包括在磁振子晶体的构建块中,则可以实现对磁振子能带结构的控制的附加自由度。我们从理论上研究了畴壁对自旋波传播和相应的磁振子能带结构的影响。结果表明,畴壁内磁化强度的旋转引入了自旋波激发的几何矢量势。对应的Berry相位具有量化值$4 n_w π$,其中$n_w$是畴壁的缠绕数。由于拓扑矢量势,具有畴壁的磁振子晶体的磁振子能带结构显著不同于仅由磁畴构成的相同磁振子晶体。这种差异可以通过磁振子晶体中畴壁的唯一成核或湮灭来实现磁振子能带结构的动态重构。

英文摘要:

Magnonic crystals are prototype magnetic metamaterials designed for the control of spin wave propagation. Conventional magnonic crystals are composed of single domain elements. If magnetization textures, such as domain walls, vortices and skyrmions, are included in the building blocks of magnonic crystals, additional degrees of freedom over the control of the magnonic band structure can be achieved. We theoretically investigate the influence of domain walls on the spin wave propagation and the corresponding magnonic band structure. It is found that the rotation of magnetization inside a domain wall introduces a geometric vector potential for the spin wave excitation. The corresponding Berry phase has quantized value $4 n_w π$, where $n_w$ is the winding number of the domain wall. Due to the topological vector potential, the magnonic band structure of magnonic crystals with domain walls as comprising elements differs significantly from an identical magnonic crystal composed of only magnetic domains. This difference can be utilized to realize dynamic reconfiguration of magnonic band structure by a sole nucleation or annihilation of domain walls in magnonic crystals.

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。

↑