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Advances in Materials Science and Engineering
Volume 2016, Article ID 4243817, 7 pages
http://dx.doi.org/10.1155/2016/4243817
Research Article

Dual Band Magnonic Crystals: Model System and Basic Spin Wave Dynamics

Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Via G. Saragat 1, 44121 Ferrara, Italy

Received 3 December 2015; Revised 13 April 2016; Accepted 23 May 2016

Academic Editor: Charles C. Sorrell

Copyright © 2016 Federico Montoncello and Loris Giovannini. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We investigate a special design of two-dimensional magnonic crystal, consisting of two superimposed lattices with different lattice constants, such that spin waves (SWs) can propagate either in one or the other sublattice, depending on which of the two frequency bands they belong to. The SW bands are separated by a very large bandgap (in our model system, 6 GHz), easily tunable by changing the direction of an applied magnetic field, and the overlap of their spatial distribution, for any frequency of their bands, is always negligible. These properties make the designed system an ideal test system for a magnonic dual band waveguide, where the simultaneous excitation and subsequent propagation of two independent SW signals are allowed, with no mutual interference.