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Medientyp:
E-Artikel
Titel:
Visibility and Apparent Size of Néel-Type Magnetic Skyrmions in Fresnel Defocus Images of Multilayer Films
Beteiligte:
Denneulin, Thibaud
[Verfasser:in];
Caron, Jan
[Verfasser:in];
Müller-Caspary, Knut
[Verfasser:in];
Boulle, Olivier
[Verfasser:in];
Kovács, András
[Verfasser:in];
Dunin-Borkowski, Rafal E.
[Verfasser:in]
Erschienen:
Cambridge University Press, 2021
Erschienen in:Microscopy and microanalysis 27(6), 1356-1365 (2021). doi:10.1017/S1431927621012927
Sprache:
Englisch
DOI:
https://doi.org/10.1017/S1431927621012927
ISSN:
1431-9276;
1435-8115
Entstehung:
Anmerkungen:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Beschreibung:
Multilayers that comprise thin films of heavy metals and ferromagnets have been shown to host Néel-type magnetic skyrmions at room temperature. Fresnel defocus imaging in Lorentz transmission electron microscopy is a widely used technique for recording magnetic information about skyrmions. However, the visibility of Néel-type skyrmions in Fresnel defocus images is typically low, both because only a small component of their magnetic field contributes to the signal and because of the presence of diffraction contrast from the polycrystalline multilayer structure. Here, we take advantage of the out-of-plane hysteresis in such samples to record background-subtracted Fresnel defocus images. We demonstrate an improvement in magnetic signal-to-noise ratio and spatial resolution by a factor of 3 for a (Pt/Co/NiFe)×5 multilayer. We also use simulated Fresnel defocus images of Néel-type magnetic skyrmions to understand the influence of defocus on apparent skyrmion size.