Discovery of Topological Magnetic Textures Near room Temperature in Quantum Magnet TbMn ₆ Sn ₆

The study of topology in quantum materials has fundamentally advanced our understanding in condensed matter physics and potential applications in next-generation quantum information technology. Recently, the discovery of a topological Chern phase in the spin-orbit coupled Kagome lattice TbMn6Sn6 has attracted considerable interest. Whereas these phenomena highlight the contribution of momentum space Berry curvature and Chern gap on the electronic transport properties, less is known about the intrinsic real space magnetic texture, which is crucial for understanding the electronic properties and further exploring the unique quantum behavior. Here, we directly observe the stabilization of topological magnetic skyrmions in TbMn6Sn6 using Lorentz transmission electron microscopy (L-TEM) near room temperature, where the spins experience full spin reorientation transition (SRT) between the a and c axes. We construct an effective spin Hamiltonian based on the Ginzburg-Landau theory and perform micromagnetic simulation to clarify the critical role of Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction on the stabilization of skyrmion lattice. Our results not only uncover non-trivially spin topological texture in TbMn6Sn6, but also provide a solid basis to study its interplay with electronic topology. This article is protected by copyright. All rights reserved