Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Poster Magnetism I

MA 7.53: Poster

Montag, 9. März 2026, 09:30–12:30, P2

Magnon-Driven Propulsion of Domain Walls in Altermagnets — •Nils Keller, Ricardo Zarzuela, Rodrigo Jaeschke-Ubiergo, and Jairo Sinova — Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany

Altermagnets form a recently identified class of collinear magnets whose compensated order coexists with time-reversal symmetry breaking and a spin-split electronic band structure with characteristic d-, g- and i-wave symmetry. Domain-wall propulsion by magnons is a central mechanism for spin-based information processing, but in antiferromagnets it relies on angular-momentum transfer because the domain-wall potential itself is reflectionless. In contrast, we show that altermagnetic domain walls can be propelled directly by magnons through linear-momentum transfer, without requiring the wall to acquire internal angular momentum first. This arises from the characteristic symmetry of the altermagnet, which generates a direction-dependent modification of the spin-wave scattering potential. As a result, both redshift and partial reflection of magnons become possible, lowering the energy cost for domain-wall motion and enabling direction-selective propulsion. These anisotropies suggest new strategies for logic and memory concepts based on steering domain walls along symmetry-selected channels. We identify the low-velocity regime and clarify the distinct scattering mechanisms responsible for the propulsion.

Keywords: Altermagnets; Domain-wall propulsion; Spin-wave scattering; Magnon transport; Spintronics