Authors:	Seng, Boris Schönke, Daniel Yeste, Javier Reeve, Robert M. Kerber, Nico Lacour, Daniel Bello, Jean-Loïs Bergeard, Nicolas Kammerbauer, Fabian Bhukta, Mona Ferté, Tom Boeglin, Christine Radu, Florin Abrudan, Radu Kachel, Torsten Mangin, Stéphane Hehn, Michel Kläui, Mathias
Title:	Direct imaging of chiral domain walls and Néel-type skyrmionium in ferrimagnetic alloys
Online publication date:	17-Sep-2021
Year of first publication:	2021
Language:	english
Abstract:	The evolution of chiral spin structures is studied in ferrimagnetic Ta/Ir/Fe/GdFeCo/Pt multilayers as a function of temperature using scanning electron microscopy with polarization analysis (SEMPA). The GdFeCo ferrimagnet exhibits pure right-handed Neel-type domain wall (DW) spin textures over a large temperature range. This indicates the presence of a negative Dzyaloshinskii-Moriya interaction that can originate from both the top Fe/Pt and the Co/Pt interfaces. From measurements of the DW width, as well as complementary magnetic characterization, the exchange stiffness as a function of temperature is ascertained. The exchange stiffness is surprisingly more or less constant, which is explained by theoretical predictions. Beyond single skyrmions, it is identified by direct imaging a pure Neel-type skyrmionium, which due to the expected vanishing skyrmion Hall angle, is a promising topological spin structure to enable applications by next generation of spintronic devices.
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-6342
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY-NC-ND
Information on rights of use:	https://creativecommons.org/licenses/by-nc-nd/4.0/
Journal:	Advanced functional materials 31 33
Pages or article number:	2102307
Publisher:	Wiley-VCH
Publisher place:	Weinheim
Issue date:	2021
ISSN:	1616-301X
Publisher URL:	https://doi.org/10.1002/adfm.202102307
Publisher DOI:	10.1002/adfm.202102307
Appears in collections:	JGU-Publikationen