Direct observation and dynamics of spontaneous skyrmion-like magnetic domains in a ferromagnet

Masahiro Nagao, Yeong Gi So, Hiroyuki Yoshida, Masaaki Isobe, Toru Hara, Kazuo Ishizuka, Koji Kimoto

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    36 Citations (Scopus)

    Abstract

    The structure and dynamics of submicrometre magnetic domains are the main factors determining the physical properties of magnetic materials. Here, we report the first observation of skyrmion-like magnetic nanodomains in a ferromagnetic manganite, La0.5 Ba0.5 MnO3, using Lorentz transmission electron microscopy (LTEM). The skyrmion-like magnetic domains appear as clusters above the Curie temperature. We found that the repeated reversal of magnetic chirality is caused by thermal fluctuation. The closely spaced clusters exhibit dynamic coupling, and the repeated magnetization reversal becomes fully synchronized with the same chirality. Quantitative analysis of such dynamics was performed by LTEM to directly determine the barrier energy for the magnetization reversal of skyrmion-like nanometre domains. This study is expected to pave the way for further investigation of the unresolved nature and dynamics of magnetic vortex-like nanodomains.

    Original languageEnglish
    Pages (from-to)325-328
    Number of pages4
    JournalNature Nanotechnology
    Volume8
    Issue number5
    DOIs
    Publication statusPublished - 2013 May

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    ASJC Scopus subject areas

    • Bioengineering
    • Biomedical Engineering
    • Materials Science(all)
    • Electrical and Electronic Engineering
    • Condensed Matter Physics
    • Atomic and Molecular Physics, and Optics

    Cite this

    Nagao, M., So, Y. G., Yoshida, H., Isobe, M., Hara, T., Ishizuka, K., & Kimoto, K. (2013). Direct observation and dynamics of spontaneous skyrmion-like magnetic domains in a ferromagnet. Nature Nanotechnology, 8(5), 325-328. https://doi.org/10.1038/nnano.2013.69