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Full-Text Articles in Physical Sciences and Mathematics
Eigen Modes And Ferromagnetic Resonance Line Width Of Inhomogeneous Thin Films, R. D. Mcmichael, Andrew Kunz, D. J. Twisselmann
Eigen Modes And Ferromagnetic Resonance Line Width Of Inhomogeneous Thin Films, R. D. Mcmichael, Andrew Kunz, D. J. Twisselmann
Physics Faculty Research and Publications
In this paper, we describe modeling of the effects of magnetic inhomogeneity on ferromagnetic resonance line width using eigen mode analyses of inhomogeneous thin magnetic films.
Normal Mode Mixing And Ferromagnetic Resonance Linewidth, Andrew Kunz, R. D. Mcmichael
Normal Mode Mixing And Ferromagnetic Resonance Linewidth, Andrew Kunz, R. D. Mcmichael
Physics Faculty Research and Publications
The normal modes of an inhomogeneous thin film are obtained by diagonalization of the perturbed Hamiltonian. The resulting modes are mixtures of the spin-wave modes and the uniform mode. We find that the ferromagnetic resonance intensity spectrum of the diagonalized system has a Lorentzian profile, and that the results correspond to the two-magnon model for weak perturbations. For stronger perturbations, the density of states is smoothed, and the spectrum becomes asymmetric due to the low-frequency cutoff of the spin-wave manifold. The technique is expected to be valid for perturbation amplitudes that are large enough to invalidate the assumptions of the …