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Observation of stable Néel skyrmions in cobalt/palladium multilayers with Lorentz transmission electron microscopy

Author

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  • Shawn D. Pollard

    (National University of Singapore)

  • Joseph A. Garlow

    (Stony Brook University
    Brookhaven National Laboratory)

  • Jiawei Yu

    (National University of Singapore)

  • Zhen Wang

    (Brookhaven National Laboratory
    Louisiana State University)

  • Yimei Zhu

    (Stony Brook University
    Brookhaven National Laboratory)

  • Hyunsoo Yang

    (National University of Singapore)

Abstract

Néel skyrmions are of high interest due to their potential applications in a variety of spintronic devices, currently accessible in ultrathin heavy metal/ferromagnetic bilayers and multilayers with a strong Dzyaloshinskii–Moriya interaction. Here we report on the direct imaging of chiral spin structures including skyrmions in an exchange-coupled cobalt/palladium multilayer at room temperature with Lorentz transmission electron microscopy, a high-resolution technique previously suggested to exhibit no Néel skyrmion contrast. Phase retrieval methods allow us to map the internal spin structure of the skyrmion core, identifying a 25 nm central region of uniform magnetization followed by a larger region characterized by rotation from in- to out-of-plane. The formation and resolution of the internal spin structure of room temperature skyrmions without a stabilizing out-of-plane field in thick magnetic multilayers opens up a new set of tools and materials to study the physics and device applications associated with chiral ordering and skyrmions.

Suggested Citation

  • Shawn D. Pollard & Joseph A. Garlow & Jiawei Yu & Zhen Wang & Yimei Zhu & Hyunsoo Yang, 2017. "Observation of stable Néel skyrmions in cobalt/palladium multilayers with Lorentz transmission electron microscopy," Nature Communications, Nature, vol. 8(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14761
    DOI: 10.1038/ncomms14761
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    Cited by:

    1. Sougata Mallick & Yanis Sassi & Nicholas Figueiredo Prestes & Sachin Krishnia & Fernando Gallego & Luis M. Vicente Arche & Thibaud Denneulin & Sophie Collin & Karim Bouzehouane & André Thiaville & Raf, 2024. "Driving skyrmions in flow regime in synthetic ferrimagnets," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    2. Ruyi Chen & Chong Chen & Lei Han & Peisen Liu & Rongxuan Su & Wenxuan Zhu & Yongjian Zhou & Feng Pan & Cheng Song, 2023. "Ordered creation and motion of skyrmions with surface acoustic wave," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    3. Sergey Zayko & Ofer Kfir & Michael Heigl & Michael Lohmann & Murat Sivis & Manfred Albrecht & Claus Ropers, 2021. "Ultrafast high-harmonic nanoscopy of magnetization dynamics," Nature Communications, Nature, vol. 12(1), pages 1-8, December.

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