Topology-dependent stability of vortex-antivortex structures

Han, Hee-Sung; Lee, Sooseok; Jung, Min-Seung; Kim, Namkyu; Chao, Weilun; Yu, Young-Sang; Hong, Jung-Il; Lee, Ki-Suk; Im, Mi-Young

doi:10.1063/5.0045593

Topology-dependent stability of vortex-antivortex structures

Journal Article · Mon May 24 04:00:00 EDT 2021 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0045593· OSTI ID:1828567

^[1]; ^[2]; Jung, Min-Seung ^[3]; ^[2]; ^[4]; ^[4]; ^[3]; ^[2]; ^[4]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Ulsan National Institute of Science and Technology, Ulsan (Korea, Republic of)
Ulsan National Institute of Science and Technology, Ulsan (Korea, Republic of)
Daegu Gyeongbuk Inst. of Science and Technology (DGIST), Daegu (Korea, Republic of)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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. Furthermore, we believe that this work provides in-depth insight into the stability of magnetic structures and its topology dependence.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1828567

Alternate ID(s):: OSTI ID: 1784577

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 21 Vol. 118; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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