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arXiv · 2608.28928

Chiral Tubular Magnonic Crystals with Periodic Dzyaloshinskii--Moriya Interaction

P. Contreras-Gallardo·J. Flores-Farias·B. Mimica-Figari·V. Puliafito·P. Landeros·R. A. Gallardo
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Abstract

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.

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P. Contreras-Gallardo, J. Flores-Farias, B. Mimica-Figari, V. Puliafito, P. Landeros, R. A. Gallardo. 2026-08-28. Chiral Tubular Magnonic Crystals with Periodic Dzyaloshinskii--Moriya Interaction. https://arxiv.org/abs/2608.28928

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