Journal Article

FZJ-2020-04171

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Off-axis electron holography of Néel-type skyrmions in multilayers of heavy metals and ferromagnets

Denneulin, T. (Corresponding author)FZJ* ; Caron, J.FZJ* ; Hoffmann, M.FZJ* ; Lin, M. ; Tan, H. K. ; Kovacs, A.FZJ* ; Blügel, S.FZJ* ; Dunin-Borkowski, R.FZJ*

2020
Elsevier Science Amsterdam

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Please use a persistent id in citations: http://hdl.handle.net/2128/26184  doi:10.1016/j.ultramic.2020.113155

Abstract: Magnetic skyrmions are complex swirling spin structures that are of interest for applications in energy-efficient memories and logic technologies. Multilayers of heavy metals and ferromagnets have been shown to host magnetic skyrmions at room temperature. Lorentz transmission electron microscopy is often used to study magnetic domain structures in multilayer samples using mainly Fresnel defocus imaging. Here, off-axis electron holography is used to obtain in-focus electron optical phase images of Néel-type domains and skyrmions in an Ir/Fe/Co/Pt multilayer sample. The preparation of the sample, reconstruction of the holograms and influence of sample tilt angle on the signal-to-noise ratio in the phase images are discussed. A good agreement is found between images of individual skyrmions that are stabilized using an external magnetic field and simulated images based on theoretical models of Néel-type skyrmions.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)
2. Quanten-Theorie der Materialien (PGI-1)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)
2. 3D MAGiC - Three-dimensional magnetization textures: Discovery and control on the nanoscale (856538) (856538)
3. DARPA, Phase 2 - Defense Advanced Research Projects Agency Manipulation of magnetic skyrmions for logicin- memory applications (Z1422.01.18) (Z1422.01.18)

Appears in the scientific report 2020

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