We report the experimental observation of the spin-wave moir\'e edge and cavity modes using Brillouin light scattering spectro-microscopy in a nanostructured magnetic moir\'e lattice consisting of two twisted triangle antidot lattices based on an yttrium iron garnet thin film. Spin-wave moir\'e edge modes are detected at an optimal twist angle and with a selective excitation frequency. At a given twist angle, the magnetic field acts as an additional degree of freedom for tuning the chiral behavior of the magnon edge modes. Micromagnetic simulations indicate that the edge modes emerge within the original magnonic band gap and at the intersection between a mini-flatband and a propagation magnon branch. Our theoretical estimate for the Berry curvature of the magnon-magnon coupling suggests a non-trivial topology for the chiral edge modes and confirms the key role played by the dipolar interaction. Our findings shed light on the topological nature of the magnon edge mode for emergent moir\'e magnonics.
@article{arxiv.2304.01001,
title = {Observation of spin-wave moir\'e edge and cavity modes in twisted magnetic lattices},
author = {Hanchen Wang and Marco Madami and Jilei Chen and Hao Jia and Yu Zhang and Rundong Yuan and Yizhan Wang and Wenqing He and Lutong Sheng and Yuelin Zhang and Jinlong Wang and Song Liu and Ka Shen and Guoqiang Yu and Xiufeng Han and Dapeng Yu and Jean-Philippe Ansermet and Gianluca Gubbiotti and Haiming Yu},
journal= {arXiv preprint arXiv:2304.01001},
year = {2026}
}