Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 30: Functional Antiferromagnetism

MA 30.1: Vortrag

Mittwoch, 11. März 2026, 09:30–09:45, POT/0151

Electric Current Control of Helimagnetic Chirality from a Multidomain State — •Yuta Kimoto¹, Hidetoshi Masuda¹, Jun-ichiro Ohe², Shoya Sakamoto¹, Takeshi Seki^1,3, and Yoshinori Onose^1,3 — ¹Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan — ²Department of Physics, Toho University, Funabashi 274-8510, Japan — ³Center for Science and Innovation in Spintronics (CSIS), Core Research Cluster, Tohoku University, Sendai 980-8577, Japan

In helimagnets, magnetic moments form a helical spin order possessing chirality. In centrosymmetric crystals, two helical states with opposite handedness are degenerate; thus, chiral domains can coexist and form domain walls. Here, we study the domain wall dynamics under electric current in the helimagnet MnAu₂. We found that the threshold current required for the transition from the multidomain state to a single-chiral domain state in a magnetic field is much lower than that for chirality reversal from a single-chiral domain within certain ranges of temperature and magnetic field. The chirality after the transition depends on whether the magnetic field and electric current were parallel or antiparallel. Numerical calculations based on the Landau-Lifshitz-Gilbert equation reproduce our observations. These results indicate that the domain walls are highly mobile in the helimagnet, reflecting a pinning potential much smaller than the domain-nucleation energy. They also suggest that helimagnetic domain walls could serve as efficient information carriers, opening new avenues for spintronic applications, such as racetrack-type memory devices.

Keywords: Charality; Switching; Helical magnet; Domain wall