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Symmetry breaking in the formation of magnetic vortex states in a permalloy nanodisk

Author

Listed:
  • Mi-Young Im

    (Center for X-ray Optics, Lawrence Berkeley National Laboratory)

  • Peter Fischer

    (Center for X-ray Optics, Lawrence Berkeley National Laboratory)

  • Keisuke Yamada

    (Institute for Chemical Research, Kyoto University)

  • Tomonori Sato

    (Graduate School of Informatics and Engineering, University of Electro-Communications)

  • Shinya Kasai

    (Spintronics Group, Magnetic Material Center, National Institute for Materials Science (NIMS))

  • Yoshinobu Nakatani

    (Graduate School of Informatics and Engineering, University of Electro-Communications)

  • Teruo Ono

    (Institute for Chemical Research, Kyoto University)

Abstract

The magnetic vortex in nanopatterned elements is currently attracting enormous interest. A priori, one would assume that the formation of magnetic vortex states should exhibit a perfect symmetry, because the magnetic vortex has four degenerate states. Here we show the first direct observation of an asymmetric phenomenon in the formation process of vortex states in a permalloy nanodisk using high-resolution full-field magnetic transmission soft X-ray microscopy. Micromagnetic simulations confirm that the intrinsic Dzyaloshinskii–Moriya interaction, which arises from the spin-orbit coupling due to the lack of inversion symmetry near the disk surface, as well as surface-related extrinsic factors, is decisive for the asymmetric formation of vortex states.

Suggested Citation

  • Mi-Young Im & Peter Fischer & Keisuke Yamada & Tomonori Sato & Shinya Kasai & Yoshinobu Nakatani & Teruo Ono, 2012. "Symmetry breaking in the formation of magnetic vortex states in a permalloy nanodisk," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1978
    DOI: 10.1038/ncomms1978
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    Cited by:

    1. Longju Yu & Hong Jian Zhao & Peng Chen & Laurent Bellaiche & Yanming Ma, 2023. "The anti-symmetric and anisotropic symmetric exchange interactions between electric dipoles in hafnia," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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