Spin inertia as a source of topological magnons: Chiral edge states from coupled precession and nutation

Ghosh, Subhadip and Cherkasskii, Mikhail and Mondal, Ritwik and Mook, Alexander and Rózsa, Levente (2026) Spin inertia as a source of topological magnons: Chiral edge states from coupled precession and nutation. PHYSICAL REVIEW RESEARCH, 8 (3). No. L032040. ISSN 2643-1564

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Abstract

Spin inertia has been demonstrated to give rise to high-frequency nutational excitations beyond the conventional low-frequency precessional modes. Here, we demonstrate that the hybridization between precessional and nutational magnons may give rise to topological phenomena in the spin-wave spectrum. This hybridization requires the presence of interactions breaking angular-momentum conservation, such as the pseudodipolar interaction. We show on the example of a honeycomb ferromagnet how topological gaps open between the precessional and nutational bands that host chiral edge states in slab geometries. Our work establishes a theoretical foundation for exploring inertial spin dynamics as a route to engineer topological phases in magnetic materials.

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