Regensburg 2025 – scientific programme
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PLV: Plenarvorträge
PLV IX
PLV IX: Plenary Talk
Thursday, March 20, 2025, 14:00–14:45, H1
Tunable Ultrafast Dynamics of Antiferromagnetic Vortices in Nanoscale Dots — •Jelena Klinovaja1, Ji Zho1, Even Thingstad1, Se Kwon Kim2, and Daniel Loss1 — 1Department of Physics University of Basel Klingelbergstrasse 82 4056 Basel, Switzerland — 2Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
Topological vortex textures in magnetic disks have garnered great attention due to their interesting physics and diverse applications. However, up to now, the vortex state has mainly been studied in microsize ferromagnetic disks, which have oscillation frequencies confined to the GHz range. We propose an experimentally feasible ultrasmall and ultrafast vortex state in an antiferromagnetic nanodot surrounded by a heavy metal, which is further harnessed to construct a highly tunable vortex network. We theoretically demonstrate that, interestingly, the interfacial Dzyaloshinskii-Moriya interaction (iDMI) induced by the heavy metal at the boundary of the dot acts as an effective chemical potential for the vortices in the interior. Mimicking the creation of a superfluid vortex by rotation, we show that a magnetic vortex state can be stabilized by this iDMI. Subjecting the system to an electric current can trigger vortex oscillations via spin-transfer torque, which reside in the THz regime and can be further modulated by external magnetic fields. Coherent coupling between vortices in different nanodisks can be achieved via an antiferromagnetic link. Remarkably, this interaction depends on the vortex polarity and topological charge and is also exceptionally tunable through the vortex resonance frequency.
Keywords: topological vortex; antiferromagnetic nanodot; interfacial Dzyaloshinskii-Moriya interaction