Olena Gomonay
Johannes Gutenberg University of Mainz, Germany
Altermagnets are magnetically ordered materials that combine the advantages of fast magnetic dynamics with large spin splitting of electronic bands, both effects arising from strong exchange (nonrelativistic) interactions between the local magnetic moments and the electron spins. In my talk I will discuss the symmetry-based approach to describe the altermagnetic textures and dynamics, using the altermagnetic candidate Mn5Si3 as a playground. The key point of the approach is an altermagnetic order parameter that formalises the symmetry of the local environment of the magnetic atoms and allows to distill the altermagnetic behaviour [1]. I will show how the concept of the altermagnetic order parameter allows to reconstruct the equilibrium magnetic structure of Mn5Si3 from the field dependences of the AHE [2-4]. I will also discuss the spin wave spectra and the dynamics of the altermagnetic domain wall, focusing on the comparison of the altermagnetic and antiferromagnetic phases of the material.
[1] O. Gomonay, et al, npj Spintronics 2, 35 (2024)[2] J. Rial, et al, Phys. Rev. B, 110, L220411 (2024).
[3] M. Leiviskä, et al, Phys. Rev. B 109, 224430 (2024).
[4] R. Zarzuela, et al, Phys. Rev. B 111, 064422 (2025).