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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 12: Skyrmions II (joint session MA/KFM)
KFM 12.4: Vortrag
Freitag, 1. Oktober 2021, 11:00–11:15, H5
Alternative to Dzyaloshinskii-Moriya interaction for monolayer Fe3GeTe2 and other two-dimensional ferromagnets with trigonal prismatic symmetry — •Ivan Ado1,2, Gulnaz Rakhmanova3, Dmitry Zezyulin3, Ivan Iorsh3, and Misha Titov1 — 1Radboud University, Institute for Molecules and Materials, 6525 AJ Nijmegen, The Netherlands — 2Institute for Theoretical Physics, Utrecht University, 3584 CC Utrecht, The Netherlands — 3ITMO University, Faculty of Physics, Saint-Petersburg, Russia
Our work reveals a new potential source of noncollinear magnetic textures in a certain class of two-dimensional ferromagnets. Namely, in those that are described by the trigonal prismatic symmetry (point group D3h): monolayer Fe3GeTe2, some transition metal dichalcogenides, and others. It is known that the Dzyaloshinskii-Moriya interaction does not contribute to the free energy density in such systems. We find that there exists a single (!) fourth order "chiral" contribution beyond the Dzyaloshinskii-Moriya interaction compatible with D3h (if boundary effects are neglected). We study whether it is consistent with recent experiments on Fe3GeTe2. We also find that this contribution might stabilize bimerons – the in-plane analog of skyrmions. Surprisingly, we were even able to estimate the radius of such bimerons analytically.
[1] I. A. Ado, Gulnaz Rakhmanova, Dmitry A. Zezyulin, Ivan Iorsh, and M. Titov, arXiv:2105.14495