Angular dependence of ferromagnetic resonance linewidth in thin films

We comment on a frequently applied analysis of an out-of-plane angular dependence of the ferromagnetic resonance linewidth Delta H in thin films. Using an expanded Suhl's formula for the field-swept linewidth, we show that the angular dependence of Delta H in a number of thin magnetic films is well described as a sum of two terms only: an intrinsic contribution and an extrinsic one due to Gilbert damping and two-magnon scattering, respectively. For some special cases (e.g., films with perpendicular anisotropy), an additional term of inhomogeneous broadening due to local variations in the out-of-plane anisotropy may be required.