Journal
PHYSICAL REVIEW LETTERS
Volume 90, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.90.227601
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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 consists of size D grains and an anisotropy field H-p that varies randomly from grain to grain in a film with thickness d and magnetization M-s. The resulting linewidth agrees well with the two-magnon model for small inhomogeneity, HpDpiM(s)d, the precession becomes localized and the spectrum approaches that of local precession on independent grains.
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