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Lee, Ki-Suk
Creative Laboratory for Advanced Spin Systems (CLASS)
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Wave modes of collective vortex gyration in dipolar-coupled-dot-array magnonic crystals

Author(s)
Han, Dong-SooVogel, AndreasJung, HyunsungLee, Ki-SukWeigand, MarkusStoll, HermannSchuetz, GiselaFischer, Peter.Meier, GuidoKim, Sang-Koog
Issued Date
2013-07
DOI
10.1038/srep02262
URI
https://scholarworks.unist.ac.kr/handle/201301/2802
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84880833694
Citation
SCIENTIFIC REPORTS, v.3, pp.1 - 7
Abstract
Lattice vibration modes are collective excitations in periodic arrays of atoms or molecules. These modes determine novel transport properties in solid crystals. Analogously, in periodical arrangements of magnetic vortex-state disks, collective vortex motions have been predicted. Here, we experimentally observe wave modes of collective vortex gyration in one-dimensional (1D) periodic arrays of magnetic disks using time-resolved scanning transmission x-ray microscopy. The observed modes are interpreted based on micromagnetic simulation and numerical calculation of coupled Thiele equations. Dispersion of the modes is found to be strongly affected by both vortex polarization and chirality ordering, as revealed by the explicit analytical form of 1D infinite arrays. A thorough understanding thereof is fundamental both for lattice vibrations and vortex dynamics, which we demonstrate for 1D magnonic crystals. Such magnetic disk arrays with vortex-state ordering, referred to as magnetic metastructure, offer potential implementation into information processing devices.
Publisher
NATURE PUBLISHING GROUP
ISSN
2045-2322

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