Manipulating the Topology of Nanoscale Skyrmion Bubbles by Spatially Geometric Confinement

Zhipeng Hou, Qiang Zhang, Guizhou Xu, Senfu Zhang, Chen Gong, Bei Ding, Hang Li, Feng Xu, Yuan Yao, Enke Liu, Guangheng Wu, Xi Xiang Zhang, Wenhong Wang

Research output: Contribution to journalArticle

Abstract

The discovery of magnetic skyrmion bubbles in centrosymmetric magnets has been receiving increasing interest from the research community, due to the fascinating physics of topological spin textures and its possible applications to spintronics. However, key challenges remain, such as how to manipulate the nucleation of skyrmion bubbles to exclude the trivial bubbles or metastable skyrmion bubbles that usually coexist with skyrmion bubbles in the centrosymmetric magnets. Here, we report having performed this task by applying spatially geometric confinement to a centrosymmetric frustrated Fe 3 Sn 2 magnet. We demonstrate that the spatially geometric confinement can indeed stabilize the skyrmion bubbles by effectively suppressing the formation of trivial bubbles and metastable skyrmion bubbles. We also show that the critical magnetic field for the nucleation of the skyrmion bubbles in the confined Fe 3 Sn 2 nanostripes is drastically less, by an order of magnitude, than that required in the thin plate without geometrical confinement. By analyzing how the width and thickness of the nanostripes affect the spin textures of skyrmion bubbles, we infer that the topological transition of skyrmion bubbles is closely related to the dipole-dipole interaction, which we find is consistent with theoretical simulations. The results presented here bring us closer to achieving the fabrication of skyrmion-based racetrack memory devices.

Original languageEnglish (US)
Pages (from-to)922-929
Number of pages8
JournalACS nano
Volume13
Issue number1
DOIs
StatePublished - Jan 22 2019

Keywords

  • Fe Sn
  • Lorentz transmission electron microscopy
  • centrosymmetric magnet
  • skyrmion bubbles
  • spatially geometrical confinement

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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  • Cite this

    Hou, Z., Zhang, Q., Xu, G., Zhang, S., Gong, C., Ding, B., Li, H., Xu, F., Yao, Y., Liu, E., Wu, G., Zhang, X. X., & Wang, W. (2019). Manipulating the Topology of Nanoscale Skyrmion Bubbles by Spatially Geometric Confinement. ACS nano, 13(1), 922-929. https://doi.org/10.1021/acsnano.8b09689