Abstract

Elementary excitations of order parameters and their propagating waves in the solid state have been intensively studied and widely applied. In ferromagnets, investigating spin excitations (e.g., magnons) in topological spin textures is highly valuable for both physics research and future device design for spintronics and magnonics. Firstly, I will begin by briefly reviewing our previous progress in manganite thin films, including a strain-gradient-driven symmetry broken for 3D anisotropic Dzyaloshinskii-Moriya interaction, and the stabilization of topological spin textures including magnetic skyrmions lattice and bimerons lattice [1-2]. Then, I will mainly present the exploration of switchable propagation of chiral magnonic edge state in quasi-antiferromagnetic spin textures [3]. Second part, I will introduce our experimental exploration of microwave excitation in ferroelectric orders. We report the all-electric excitation, detection and manipulation of coherent polarization waves in self-organized antiparallel-coupled ferroelectric domains [4].

1. Y. Zhang et al., Strain-Driven Dzyaloshinskii-Moriya Interaction for Room-Temperature. Phys. Rev. Lett. 127, 117204 (2021)

2. M. Cai, Y. Zhang et al., Stabilization and Observation of Large-Area Ferromagnetic Bimeron Lattice. Phys. Rev. Lett. 135, 116703 (2025)

3. Y. Zhang et al., Switchable long-distance propagation of chiral magnonic edge states. Nat. Mater. 24, 69–75 (2025)

4. Y. Zhang et al., observation and control of ferroelectric polarization waves, unpublished.