Authors:	Schmitt, Maurice Denneulin, Thibaud Kovács, András Saunderson, Tom G. Rüßmann, Philipp Shahee, Aga Scholz, Tanja Tavabi, Amir H. Gradhand, Martin Mavropoulos, Phivos Lotsch, Bettina V. Dunin-Borkowski, Rafal E. Mokrousov, Yuriy Blügel, Stefan Kläui, Mathias
Title:	Skyrmionic spin structures in layered Fe5GeTe2 up to room temperature
Online publication date:	16-Dec-2022
Year of first publication:	2022
Language:	english
Abstract:	The role of the crystal lattice, temperature and magnetic field for the spin structure formation in the 2D van der Waals magnet Fe5GeTe2 with magnetic ordering up to room temperature is a key open question. Using Lorentz transmission electron microscopy, we experimentally observe topological spin structures up to room temperature in the metastable pre-cooling and stable post-cooling phase of Fe5GeTe2. Over wide temperature and field ranges, skyrmionic magnetic bubbles form without preferred chirality, which is indicative of centrosymmetry. These skyrmions can be observed even in the absence of external fields. To understand the complex magnetic order in Fe5GeTe2, we compare macroscopic magnetometry characterization results with microscopic density functional theory and spin-model calculations. Our results show that even up to room temperature, topological spin structures can be stabilized in centrosymmetric van der Waals magnets.
DDC:	530 Physik 530 Physics
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 08 Physik, Mathematik u. Informatik
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-8486
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Communications Physics 5
Pages or article number:	254
Publisher:	Springer Nature
Publisher place:	London
Issue date:	2022
ISSN:	2399-3650
Publisher DOI:	10.1038/s42005-022-01031-w
Appears in collections:	DFG-491381577-G