Dynamics of the Bloch point in an asymmetric permalloy disk
| Autor: | Weilun Chao, Jung-Il Hong, Seongsoo Yoon, Hee-Sung Han, Ki-Suk Lee, Peter Fischer, Sooseok Lee, Mi-Young Im, Young-Sang Yu, Min-Seung Jung |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Permalloy Science General Physics and Astronomy 02 engineering and technology Article General Biochemistry Genetics and Molecular Biology Topological defect 03 medical and health sciences Magnetization MD Multidisciplinary lcsh:Science Spin-½ Physics Multidisciplinary Condensed matter physics Texture (cosmology) General Chemistry 021001 nanoscience & nanotechnology Magnetic field Vortex 030104 developmental biology Ferromagnetism lcsh:Q 0210 nano-technology |
| Zdroj: | Nature Communications, Vol 10, Iss 1, Pp 1-8 (2019) Nature Communications Nature communications, vol 10, iss 1 Im, Mi-Young; Han, Hee-Sung; Jung, Min-Seung; Yu, Young-Sang; Lee, Sooseok; Yoon, Seongsoo; et al.(2019). Dynamics of the Bloch point in an asymmetric permalloy disk.. Nature communications, 10(1), 593. doi: 10.1038/s41467-019-08327-6. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/7cd718pz |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-019-08327-6. |
| Popis: | 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. The intrinsic nature and dynamics of a Bloch point has not been verified so far. Here, Im et al. report the realization and dynamical character of steady-state Bloch points in the magnetic vortex cores in asymmetrically shaped Ni80Fe20 nanodisks. |
| Databáze: | OpenAIRE |
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