EN
Ferromagnetic resonance was employed to study the magnetic anisotropy of the Fe thin film in the MgO/Cu(t_{Cu})/Fe/Cu system. The Fe film showed strong fourfold cubic anisotropy (H_{K_{1}} = 2K_{1}/M = 46.15 kA/m) for t_{Fe} = 23 nm and t_{Cu} = 0. The spread of the crystallographic axes Δβ = 0.5° was evaluated from the angular dependence of the resonance line width ΔH_{pp} (4.4 < ΔH_{pp} < 6.4 kA/m). Such a small mosaicity confirmed the epitaxial growth of the Fe film. The Cu buffer layer destroys this growth of the Fe film which showed only a weak anisotropy.