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 consists of size grains and an anisotropy field that varies randomly from grain to grain in a film with thickness and magnetization . The resulting linewidth agrees well with the two-magnon model for small inhomogeneity, . For large inhomogeneity, , the precession becomes localized and the spectrum approaches that of local precession on independent grains.
- Received 23 December 2002
DOI:https://doi.org/10.1103/PhysRevLett.90.227601
©2003 American Physical Society