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.
Highlights
In recent years the field of magnonics has received considerable attention and has developed very fast: the idea of manipulating spin wave (SW) propagation, through its Bragg diffraction in artificial lattices in which magnetic properties are periodically varied, has been extensively investigated in numerous systems, both theoretically and experimentally, with numerous applications [1, 2]
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
We study the system within the micromagnetic framework, computing the equilibrium magnetization by the software OOMMF [22] and the spin wave dynamics by the dynamical matrix method (DMM) [23]
Summary
In recent years the field of magnonics has received considerable attention and has developed very fast: the idea of manipulating spin wave (SW) propagation, through its Bragg diffraction in artificial lattices in which magnetic properties are periodically varied (magnonic crystals, MCs), has been extensively investigated in numerous systems, both theoretically and experimentally, with numerous applications [1, 2]. Material, magnetization, and applied field, collective SWs in MCs can be controlled at will for specific purposes and applications [3,4,5,6,7,8]. We characterize the two spin wave types, by determining the two localization areas and the extension of the corresponding bands
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