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Curvilinear Magnonic Crystal Based on 3D Hierarchical Nanotemplates
Gianluca Gubbiotti1, Olha Bezsmertna2, Oleksandr V Pylypovskyi2,3
1CNR-Istituto Officina dei Materiali (IOM), 06123 Perugia, Italy.
Nano Letters
|January 23, 2026
Summary
This study introduces a novel curvilinear magnonic crystal for controlling spin waves using geometry. The research demonstrates how 3D hierarchical templates enable curvature-engineered magnonics for advanced spintronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Curvilinear magnetic nanostructures offer unique control over magnetization dynamics.
- Geometry-induced anisotropy and chiral interactions are key to manipulating spin waves.
Purpose of the Study:
- To report a curvilinear magnonic crystal fabricated using 3D hierarchical templates.
- To investigate the spin-wave band structure and propagation characteristics in these nanostructures.
Main Methods:
- Fabrication of large-area square arrays of truncated nanospikes via conformal coating of 3D hierarchical templates with permalloy.
- Characterization using Brillouin light scattering spectroscopy.
- Analysis using finite element micromagnetic simulations.
Main Results:
- Observed an anisotropic band structure with dispersive and nondispersive spin-wave modes.
- Demonstrated direction-dependent frequency shifts and intensity asymmetries.
- Identified curvature-induced demagnetizing field variations governing magnonic response, with modes localized on nanospikes and connecting ridges.
Conclusions:
- Curvature-engineered magnonics can be achieved using 3D hierarchical templates.
- Geometric curvature significantly influences magnonic band structure and mode localization.
- This platform is versatile for developing advanced magnonic devices.
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