Magnetic Field Controlled Surface Localization of Spin-Wave Ferromagnetic Resonance Modes in 3D Nanostructures

TL;DR

This paper demonstrates how 3D nanostructures can localize spin-wave FMR modes on their surfaces, with magnetic field orientation controlling the mode localization, advancing the understanding of 3D magnonics.

Contribution

It introduces the design and simulation of complex 3D nanostructures for surface localization of spin-wave modes, revealing dynamic control via magnetic field orientation.

Findings

Surface localization of spin-wave modes in 3D structures.

Magnetic field orientation switches mode localization.

Geometric features influence magnetic behavior.

Abstract

Extending the current understanding and use of magnonics beyond conventional planar systems, we demonstrate surface localization of spin-wave ferromagnetic resonance (FMR) modes by designing complex three-dimensional nanostructures. Using micromagnetic simulations, we systematically investigate woodpile-like scaffolds and gyroids - periodic chiral entities characterized by their triple junctions. The study highlights the critical role of demagnetizing fields and exchange energy in determining the FMR responses of 3D nanosystems, especially the strongly asymmetric distribution of the spin-wave mode over the system height. Importantly, the top-bottom dynamic switching of the surface mode localization across the structures in response to changes in magnetic field orientation provides a new method for controlling magnetization dynamics. The results demonstrate the critical role of the geometric features in dictating the dynamic magnetic behavior of three-dimensional nanostructures, paving the way for both experimental exploration and practical advances in 3D magnonics.