Spin wave damping in periodic and quasiperiodic magnonic structures

Abstract

We investigated the lifetime of spin wave eigenmodes in periodic and quasiperiodic sequences of Py and Co wires. Those materials differ significantly in damping coefficients, therefore, the spatial distribution of the mode amplitude within the structure is important for the lifetime of collective spin wave excitations. Modes of the lower frequencies prefer to concentrate in Py wires, because of the lower FMR frequency for this material. This inhomogeneous distribution of amplitude of modes (with lower amplitude in material of higher damping and with higher amplitude in material of lower damping) is preferable for extending the lifetime of the collective excitations beyond the volume average of lifetimes for solid materials. We established the relation between the profile of the mode and its lifetime for periodic and quasiperiodic structures. We performed also the comparative studies in order to find the differences resulting from complexity of the structure and enhancement of localization in quasiperiodic system on the lifetime of spin waves.

arXiv comment16 pages, 8 figures

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• Experimental Evidence of Non-Negligible Imaginary Part of Spin Mixing Conductance and Its Impact on Magnetization Dynamics in Heavy-Metal|Ferromagnet Bilayers
• Spin wave surface states in one-dimensional planar magnonic crystals
• Remagnetization in the array of ferromagnetic nanowires with periodic and quasiperiodic order
• Magnetization Dynamics in Quasiperiodic Magnonic Crystals
• Control of the phase of reflected spin-waves from magnonic Gires-Tournois interferometer of subwavelength width