Ab initio Spin Wave Analysis of MnBi₂Te₄

The coexistence of magnetism and topological band structure in MnBi₂Te₄ and related compounds offers a platform for realizing the quantum anomalous Hall effect and developing ultrafast magnetic devices. To accurately capture their magnetization dynamics beyond linear spin-wave theory, we study spin excitations in MnBi₂Te₄ using an ab initio-informed framework under tunable external parameters. We examine the role of induced magnetic moments on Bi/Te p-orbitals and compare our results with heat capacity and magnetization data. The computed magnon spectra reveal their evolution with temperature and applied field, providing a foundation for understanding the interplay between topology, surface states, and spin dynamics in this material family.