Asymmetry of spin wave dispersions in a hexagonal magnonic crystal
Montoncello, F; Tacchi, S; Giovannini, L; et al.Madami, M; Gubbiotti, G; Carlotti, G; Sirotkin, E; Ahmad, E; Ogrin, FY; Kruglyak, VV
Date: 24 May 2013
Article
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Publisher DOI
Abstract
We report a study of the dispersion of spin waves in a hexagonal array of interacting ferromagnetic nanodisks for two orthogonal orientations of the in-plane applied magnetic field, i.e., either parallel or perpendicular to the direction of first neighbour disks. The experimental data were modelled using the dynamical matrix method, ...
We report a study of the dispersion of spin waves in a hexagonal array of interacting ferromagnetic nanodisks for two orthogonal orientations of the in-plane applied magnetic field, i.e., either parallel or perpendicular to the direction of first neighbour disks. The experimental data were modelled using the dynamical matrix method, and the results were interpreted in terms of the effective wave vector model. We have found that spin waves propagating in the two orthogonal directions exhibit marked asymmetry concerning the existence of maxima/minima in their dispersion curves and the sign of their group velocities. © 2013 AIP Publishing LLC.
Physics and Astronomy
Faculty of Environment, Science and Economy
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