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Lee, Ki-Suk
Creative Lab. for Advanced Spin Systems (CLASS)
Research Interests
  • Magnetism, spintronics, spin dynamics, rare-earth free magnet

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Wave modes of collective vortex gyration in dipolar-coupled-dot-array magnonic crystals

Cited 8 times inthomson ciCited 4 times inthomson ci
Title
Wave modes of collective vortex gyration in dipolar-coupled-dot-array magnonic crystals
Author
Han, Dong-SooVogel, AndreasJung, HyunsungLee, Ki-SukWeigand, MarkusStoll, HermannSchuetz, GiselaFischer, Peter.Meier, GuidoKim, Sang-Koog
Keywords
SPIN-WAVES; REVERSAL; EXCITATIONS; DYNAMICS
Issue Date
201307
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v.3, no., 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.
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DOI
http://dx.doi.org/10.1038/srep02262
ISSN
2045-2322
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MSE_Journal Papers
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