Three-dimensional observation of magnetic vortex cores in stacked ferromagnetic discs

Toshiaki Tanigaki, Yoshio Takahashi, Tomokazu Shimakura, Tetsuya Akashi, Ruriko Tsuneta, Akira Sugawara, Daisuke Shindo

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Electron holographic vector field electron tomography visualized three-dimensional (3D) magnetic vortices in stacked ferromagnetic discs in a nanoscale pillar. A special holder with two sample rotation axes, both without missing wedges, was used to reduce artifacts in the reconstructed 3D magnetic vectors. A 1 MV holography electron microscope was used to precisely measure the magnetic phase shifts. Comparison of the observed 3D magnetic field vector distributions in the magnetic vortex cores with the results of micromagnetic simulations based on the Landau-Lifshitz-Gilbert equation showed that the proposed technique is well suited for direct 3D visualization of the spin configurations in magnetic materials and spintronics devices.

Original languageEnglish
Pages (from-to)1309-1314
Number of pages6
JournalNano Letters
Volume15
Issue number2
DOIs
Publication statusPublished - 2015 Feb 11

Keywords

  • Magnetic vortex
  • electron holography
  • ferromagnetic disc
  • vector field tomography

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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  • Cite this

    Tanigaki, T., Takahashi, Y., Shimakura, T., Akashi, T., Tsuneta, R., Sugawara, A., & Shindo, D. (2015). Three-dimensional observation of magnetic vortex cores in stacked ferromagnetic discs. Nano Letters, 15(2), 1309-1314. https://doi.org/10.1021/nl504473a