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Ferromagnetic resonance experiments have been performed on Fe 3 O 4 layers with thicknesses in the range of 1.5-115 nm, which have been grown by molecular beam epitaxy on (0 0 1)MgO substrates. For large layer thicknesses, the magnitude as well as the temperature dependence of the magnetic anisotropy resemble the bulk Fe 3 O 4 behavior. At room temperature, the magnetic...