发表机构
Universidad Técnica Federico Santa María; Universidad de Chile; Politecnico di Bari（费德里科·萨马利亚技术大学; 智利大学; 巴里理工大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究提出一种具有周期性DMI的手性管状磁振子晶体，通过适配圆柱几何的平面波形式计算其自旋波能带，发现管状几何可调控DMI作用，产生两类特殊能带，为弯曲结构的磁振子调控提供新途径。
AI 中文摘要
我们提出了一种手性管状磁振子晶体，它由具有周期性调制界面Dzyaloshinskii–Moriya相互作用（DMI）的铁磁纳米管构成。采用适配圆柱几何的平面波形式，我们计算了包含交换、非局域偶极耦合和界面DMI的自旋波能带结构。结果表明，与平面手性磁振子晶体相比，管状几何从本质上改变了周期性DMI的作用。除了产生常规的非互易频移外，曲率还将部分界面DMI转化为类有效各向同性内场，沿管形成与符号相关的频域，使覆盖DMI的区域可作为最低频模式的势阱或势垒。因此，在类Damon–Eshbach和类反向体积两种构型中均出现平坦且弱色散的能带，后者在平面系统中无直接对应物。本研究表明，纳米管中周期性设计的DMI是控制弯曲结构中非互易自旋波、局域模式和平坦磁振子能带的一种途径。
英文摘要
We introduce a chiral tubular magnonic crystal formed by a ferromagnetic nanotube with a periodically modulated interfacial Dzyaloshinskii--Moriya interaction (DMI). Using a plane-wave formalism adapted to the cylindrical geometry, we calculate the spin-wave band structure including exchange, nonlocal dipolar coupling, and interfacial DMI. We show that the tubular geometry qualitatively modifies the role of periodic DMI compared with planar chiral magnonic crystals. Besides producing the usual nonreciprocal frequency shift, curvature converts part of the interfacial DMI into an effective anisotropy-like internal field. This creates a sign-dependent frequency landscape along the tube, so that DMI-covered regions can act either as potential wells or barriers for the lowest-frequency modes. As a result, flat and weakly dispersive bands appear in both Damon--Eshbach-like and backward-volume-like configurations, with the latter having no direct counterpart in planar systems. Our results identify periodically engineered DMI in nanotubes as a route for controlling nonreciprocal spin waves, localized modes, and flat magnonic bands in curved architectures.
Comments14 pages, 4 figures
