Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 43: Focus Session: Higher-Order Magnetic Interactions – Implications in 2D and 3D Magnetism I

MA 43.1: Invited Talk

Thursday, March 19, 2020, 09:30–10:00, HSZ 04

Magnetic vortices, skyrmions, and hedgehogs stabilized by long-range multiple-spin interactions — •Yukitoshi Motome — The University of Tokyo, Tokyo, Japan

Topological magnetic textures, such as vortices, skyrmions, and hedgehogs, have attracted numerous attention for the potential use of their magnetic, transport, and optical properties for future spintronics and quantum computing. For materializing such unconventional magnetism, it is crucially important to understand the relevant magnetic interactions. Widely known is the relativistic Dzyaloshinskii-Moriya interaction, which stabilizes swirling spin textures in competition with ferromagnetic exchange interactions. Here, we theoretically study another interactions working for more than two spins simultaneously. We show that such multiple-spin interactions naturally arise in itinerant magnets as higher-order contributions from the spin-charge coupling. They are intrinsically long-ranged with characteristic wave numbers specified by the Fermi surfaces, like the Ruderman-Kittel-Kasuya-Yosida interaction. We find that such long-range multiple-spin interactions can stabilize a variety of topological magnetic textures with unique features, even in centrosymmetric systems where the Dzyaloshinskii-Moriya interaction is absent: vortex crystals with chiral stripes, skyrmion crystals with a high topological number, unusual skyrmions in Rashba metals, and magnetic hedgehog lattices. We discuss our results with recent advances in experiments.