Journal Article

FZJ-2021-04059

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Visibility and Apparent Size of Néel-Type Magnetic Skyrmions in Fresnel Defocus Images of Multilayer Films

Denneulin, T. (Corresponding author)FZJ* ; Caron, J. ; Müller-Caspary, K. (Corresponding author)FZJ* ; Boulle, O. ; Kovács, A.FZJ* ; Dunin-Borkowski, R. E.FZJ*

2021
Cambridge University Press New York, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/29305  doi:10.1017/S1431927621012927

Abstract: 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.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 5351 - Platform for Correlative, In Situ and Operando Characterization (POF4-535) (POF4-535)
2. DARPA, Phase 2 - Defense Advanced Research Projects Agency Manipulation of magnetic skyrmions for logicin- memory applications (Z1422.01.18) (Z1422.01.18)
3. 3D MAGiC - Three-dimensional magnetization textures: Discovery and control on the nanoscale (856538) (856538)
4. ESTEEM3 - Enabling Science and Technology through European Electron Microscopy (823717) (823717)

Appears in the scientific report 2021

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