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Topology-dependent stability of vortex-antivortex structures

Title
Topology-dependent stability of vortex-antivortex structures
Author(s)
Han, Hee-SungLee, SooseokJung, Min-SeungKim, NamkyuChao, WeilunYu, Young-SangHong, Jung-IlLee, Ki-SukIm, Mi-Young
DGIST Authors
Han, Hee-SungLee, SooseokJung, Min-SeungKim, NamkyuChao, WeilunYu, Young-SangHong, Jung-IlLee, Ki-SukIm, Mi-Young
Issued Date
2021-05
Type
Article
Keywords
Binary alloysIron alloysIron metallographyMagnetic structureMagnetizationNickel metallographyStabilityTopologyX raysAnnihilation mechanismsDependent stabilityMagnetic transmissionsMagnetization configurationMicromagnetic simulationsNon-uniform magnetizationsSoft x-ray microscopyTopological chargesVortex flow
ISSN
0003-6951
Abstract
The non-trivial topology of magnetic structures such as vortices and skyrmions is considered as a key concept to explain the stability of those structures. The stability, dictated by non-trivial topology, provides great potential for device applications. Although it is a very critical scientific and technological issue, it is elusive to experimentally study the topology-dependent stability owing to the difficulties in establishing stably formed magnetic structures with different topologies. Here, we establish a platform for vortex-antivortex structures with different topological charges within Ni80Fe20 rectangular elements thick enough to stabilize a unique three-dimensional magnetic structure with non-uniform magnetization along the thickness of the elements. The detailed magnetization configurations of the three-dimensional vortex-antivortex structures and their annihilations during their field-driven motions are investigated by utilizing magnetic transmission soft x-ray microscopy and micromagnetic simulation. We demonstrate that the stability of vortex-antivortex structures significantly depends on their topologies and the topology-dependent stability is associated with their different annihilation mechanisms. We believe that this work provides in-depth insight into the stability of magnetic structures and its topology dependence. © 2021 Author(s).
URI
http://hdl.handle.net/20.500.11750/15499
DOI
10.1063/5.0045593
Publisher
American Institute of Physics
Related Researcher
  • 홍정일 Hong, Jung-Il 화학물리학과
  • Research Interests Electric and Magnetic Properties of Nanostructured Materials; Spintronics
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Appears in Collections:
Department of Physics and Chemistry Spin Nanotech Laboratory 1. Journal Articles

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