Document Type

Article

Language

eng

Publication Date

6-2003

Publisher

American Physical Society

Source Publication

Physical Review Letters

Source ISSN

0031-9007

Abstract

The effect of sample inhomogeneity on the ferromagnetic resonance linewidth is determined by diagonalization of a spin wave Hamiltonian for ferromagnetic thin films with inhomogeneities spanning a wide range of characteristic length scales. A model inhomogeneity is used that consist of size D grains and an anisotropy field Hp that varies randomly from grain to grain in a film with thickness d and magnetization Ms. The resulting linewidth agrees well with the two-magnon model for small inhomogeneity, HpD « πMsd. For large inhomogeneity, HpD » πMsd the precession becomes localized and the spectrum approaches that of local precession on independent grains.

Comments

Published version. Physical Review Letters, Vol. 90, No. 22 (June 2003). DOI. © American Physical Society 2003. Used with permission.

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