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Dynamics of the Bloch point in an asymmetric permalloy disk

Title
Dynamics of the Bloch point in an asymmetric permalloy disk
Authors
Im, Mi‐YoungHan, Hee-SungJung, Min SeungYu, Young-SangLee, SooseokYoon, SeongsooChao, WeilunFischer, PeterHong, Jung-IlLee, Ki-Suk
DGIST Authors
Hong, Jung-Il
Issue Date
2019-02
Citation
Nature Communications, 10
Type
Article
Article Type
Article
ISSN
2041-1723
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. © 2019, The Author(s).
URI
http://hdl.handle.net/20.500.11750/9605
DOI
10.1038/s41467-019-08327-6
Publisher
Nature Publishing Group
Related Researcher
  • Author Hong, Jung-Il Spin Nanotech Laboratory
  • Research Interests Electric and Magnetic Properties of Nanostructured Materials; Spintronics
Files:
Collection:
Department of Emerging Materials ScienceSpin Nanotech Laboratory1. Journal Articles


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