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Dynamics of the Bloch point in an asymmetric permalloy disk

Author

Listed:
  • Mi-Young Im

    (Lawrence Berkeley National Laboratory
    DGIST
    Ulsan National Institute of Science and Technology)

  • Hee-Sung Han

    (Ulsan National Institute of Science and Technology)

  • Min-Seung Jung

    (DGIST)

  • Young-Sang Yu

    (Lawrence Berkeley National Laboratory)

  • Sooseok Lee

    (Ulsan National Institute of Science and Technology)

  • Seongsoo Yoon

    (DGIST)

  • Weilun Chao

    (Lawrence Berkeley National Laboratory)

  • Peter Fischer

    (Lawrence Berkeley National Laboratory
    University of California, Santa Cruz)

  • Jung-Il Hong

    (DGIST)

  • Ki-Suk Lee

    (Ulsan National Institute of Science and Technology)

Abstract

A Bloch point (BP) is a topological defect in a ferromagnet at which the local magnetization vanishes. With the difficulty of generating a stable BP in magnetic nanostructures, the intrinsic nature of a BP and its dynamic behaviour has not been verified experimentally. We report a realization of steady-state BPs embedded in deformed magnetic vortex cores in asymmetrically shaped Ni80Fe20 nanodisks. Time-resolved nanoscale magnetic X-ray imaging combined with micromagnetic simulation shows detailed dynamic character of BPs, revealing rigid and limited lateral movements under magnetic field pulses as well as its crucial role in vortex-core dynamics. Direct visualizations of magnetic structures disclose the unique dynamical feature of a BP as an atomic scale discrete spin texture and allude its influence on the neighbouring spin structures such as magnetic vortices.

Suggested Citation

  • Mi-Young Im & Hee-Sung Han & Min-Seung Jung & Young-Sang Yu & Sooseok Lee & Seongsoo Yoon & Weilun Chao & Peter Fischer & Jung-Il Hong & Ki-Suk Lee, 2019. "Dynamics of the Bloch point in an asymmetric permalloy disk," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-08327-6
    DOI: 10.1038/s41467-019-08327-6
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    Cited by:

    1. Yu-Jia Wang & Yan-Peng Feng & Yun-Long Tang & Yin-Lian Zhu & Yi Cao & Min-Jie Zou & Wan-Rong Geng & Xiu-Liang Ma, 2024. "Polar Bloch points in strained ferroelectric films," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    2. Matthieu Grelier & Florian Godel & Aymeric Vecchiola & Sophie Collin & Karim Bouzehouane & Albert Fert & Vincent Cros & Nicolas Reyren, 2022. "Three-dimensional skyrmionic cocoons in magnetic multilayers," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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