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MA: Fachverband Magnetismus

MA 43: Skyrmions III / Non-Skyrmionic Magnetic Textures II

MA 43.2: Vortrag

Freitag, 21. März 2025, 09:45–10:00, H16

Spiral multiferroics as a natural skyrmion racetrack — •Luca Maranzana^1,2, Maxim Mostovoy³, Naoto Nagaosa⁴, and Sergey Artyukhin¹ — ¹Quantum Materials Theory, Italian Institute of Technology, Via Morego 30, Genoa, Italy — ²Department of Physics, University of Genoa, Via Dodecaneso 33, Genoa, Italy — ³Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 3, 9747 AG Groningen, Netherlands — ⁴RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan

Magnetic skyrmions are localized spin textures with a nontrivial topology. This property ensures excellent stability even at nanometer length scales, establishing skyrmions as promising information carriers in magnetic storage and processing devices. Still, their fate in a wide variety of magnetic backgrounds is poorly understood. Here, we show that spiral multiferroics, some of the most basic non-collinear magnets, host bimerons, a particular type of skyrmion. Multiferroic properties of a spin spiral endow the bimeron with magnetic and ferroelectric dipole moments that, surprisingly, depend on its position relative to the spiral. This enables precise positioning of the bimeron by a rotating magnetic field (e.g. of a circularly polarized electromagnetic wave). At low frequencies, the bimeron magnetic moment rotates in sync with the field, and this topological spin texture is pumped in the Archimedean screw fashion. The results establish spiral multiferroics as a natural racetrack, where one full rotation of the field moves the bimeron by one spiral period.

Keywords: Bimerons; Spiral multiferroics; Magnetization dynamics; Skyrmion racetrack; Archimedean screw