Direct Imaging of Chiral Domain Walls and Néel‐Type Skyrmionium in Ferrimagnetic Alloys

Medientyp: E-Artikel

Titel: Direct Imaging of Chiral Domain Walls and Néel‐Type Skyrmionium in Ferrimagnetic Alloys

Beteiligte: 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

Erschienen: Wiley, 2021

Sprache: Englisch

DOI: 10.1002/adfm.202102307

ISSN: 1616-301X; 1616-3028

Schlagwörter: Electrochemistry ; Condensed Matter Physics ; Biomaterials ; Electronic, Optical and Magnetic Materials

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Beschreibung: AbstractThe 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 Néel‐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 Néel‐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.

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