TRR 360 Sonderseminar:

Emergent Magnetic Textures in Topological Materials

Oleg Trietiakov

Emergent Magnetic Textures in Topological Materials

Prof. Oleg Trietiakov

School of Physics, University of New South Wales, Sydney, Australia

I will discuss emergent topological magnetic textures, including skyrmions, merons, bimerons, and antibimerons, which form nanoscale chiral whirls in magnetic order. These textures are promising candidates for information carriers in next-generation electronic and spintronic devices because they can be efficiently driven at high velocities by current-induced spin torques. I will first focus on bimerons [1] and antibimerons [2] in ferromagnetic topological materials and discuss their spin-wave modes. I will then show that antiferromagnets can also host a rich variety of such textures, offering advantages such as terahertz dynamics, deflection-free motion [3], and improved size scaling due to the absence of stray fields. Finally, I will demonstrate that merons and bimerons can be generated at room temperature and reversibly moved by electrical pulses in both antiferromagnetic [4] and ferromagnetic systems [5].

References:
[1] B. Göbel, A. Mook, I. Mertig, O. A. Tretiakov, Phys. Rev. B 99, 060407(R) (2019); K. Ohara, O. A. Tretiakov, et al., Nano Lett. 22, 8559 (2022).
[2] P. A. Vorobyev, D. Kurebayashi, O. A. Tretiakov, APS Open Sci. 1, 000075 (2026); arXiv:2604.09178 (2026).
[3] J. Barker and O. A. Tretiakov Phys. Rev. Lett. 116, 147203 (2016).
[4] O. J. Amin, O. A. Tretiakov, et al. Nature Nano. 18, 849 (2023).
[5] J. Chen, O. A. Tretiakov, et al., Phys. Rev B 112, 224420 (2025).