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

Han, Dong-Soo; Vogel, Andreas; Jung, Hyunsung; Lee, Ki-Suk; Weigand, Markus; Stoll, Hermann; Schütz, Gisela; Fischer, Peter; Meier, Guido; Kim, Sang-Koog

doi:10.1038/srep02262

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

Journal Article · Tue Jul 23 04:00:00 EDT 2013 · Scientific Reports

DOI:https://doi.org/10.1038/srep02262· OSTI ID:1624634

Han, Dong-Soo ^[1]; Vogel, Andreas ^[2]; Jung, Hyunsung ^[3]; Lee, Ki-Suk ^[3]; Weigand, Markus ^[4]; Stoll, Hermann ^[4]; Schütz, Gisela ^[4]; Fischer, Peter ^[5]; Meier, Guido ^[6]; Kim, Sang-Koog ^[3]

Seoul National Univ. (Korea, Republic of). Dept. of Materials Science and Engineering. Research Inst. of Advanced Materials. Nanospinics Lab. National Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices; DOE/OSTI
Univ. of Hamburg (Germany). Institut fur Angewandte Physik. Zentrum fur Mikrostrukturforschung
Seoul National Univ. (Korea, Republic of). Dept. of Materials Science and Engineering. Research Inst. of Advanced Materials. Nanospinics Lab. National Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices
Max Planck Society, Stuttgart (Germany). Inst. fur Intelligente Systeme
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Center for X-ray Optics
Univ. of Hamburg (Germany). Institut fur Angewandte Physik. Zentrum fur Mikrostrukturforschung

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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1624634

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 3; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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