Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 12: Magnetization Dynamics and Damping

MA 12.3: Talk

Tuesday, March 18, 2025, 10:00–10:15, H19

propelling ferrimagnetic domain walls by dynamical frustration — •reza doostani — university of cologne, cologne, germany

In this work, we realize the concept of active matter in a solid state system. By sending a ferrimagnet out of equilibrium by an oscillating magnetic field, we activate rotational goldstone mode where spins start to rotate clockwise or anti-clockwise depending on the ferromagnetic component. We see that in this setup, a domain wall moves actively to the left or right due to dynamical frustration. We further discuss the dynamics of these domain walls and the relation between domain wall motion and the external field amplitude, as well as their interaction and consequence of these on the whole system. Furthermore, we continue to study the effect of defects on the movement of domain walls.

Keywords: domain walls; dynamical frustration; active matter; goldstone mode; out of equilibrium