Title

Normal Mode Mixing and Ferromagnetic Resonance Linewidth

Document Type

Article

Language

eng

Publication Date

9-2002

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Source Publication

IEEE Transactions on Magnetics

Source ISSN

0018-9464

Abstract

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 two-magnon model.

Comments

IEEE Transactions on Magnetics, Vol. 38, No. 5 (September 2002): 2400-2402. DOI.

Andrew Kunz was affiliated with the National Institute of Standards and Technology at the time of publication.

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