Dynamics of the Bloch point in an asymmetric permalloy disk

Mi-Young Im (), Hee-Sung Han, Min-Seung Jung, Young-Sang Yu, Sooseok Lee, Seongsoo Yoon, Weilun Chao, Peter Fischer, Jung-Il Hong () and Ki-Suk Lee ()
Additional contact information
Mi-Young Im: Lawrence Berkeley National Laboratory
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
Jung-Il Hong: DGIST
Ki-Suk Lee: Ulsan National Institute of Science and Technology

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-08327-6

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