Experimental observation of multiple- Q states for the magnetic skyrmion lattice and skyrmion excitations under a zero magnetic field

Masahiro Nagao, Yeong Gi So, Hiroyuki Yoshida, Kazunari Yamaura, Takuro Nagai, Toru Hara, Atsushi Yamazaki, Koji Kimoto

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    Abstract

    Model calculations indicate that the magnetic skyrmion lattice (SkL) is represented by a superposition of three spin helices at an angle of 120 to each other, the so-called triple-Q state. Using Lorentz transmission electron microscopy, we investigated the relationship between the SkL and the helix in FeGe thin films. After the magnetic field is removed, the ordered skyrmions are trapped inside helimagnetic domain walls (HDWs) where the different helical Q vectors are encountered. In situ observation revealed an unexpected topological excitation under such a zero-field state: skyrmions are spontaneously formed at HDWs.

    Original languageEnglish
    Article number140415
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume92
    Issue number14
    DOIs
    Publication statusPublished - 2015 Oct 27

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    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

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