We investigate the magneto-optical properties of a nonstoichiometric, epitaxial film grown on a MgO-buffered MgO(001) single-crystal substrate. Magneto-optical Kerr effect magnetometry indicates that the sample has strong uniaxial anisotropy, whereas the easy and hard axes of magnetization are tilted by with respect to the [110] and directions, respectively. A modest quadratic Kerr effect with an amplitude of 0.4 mdeg was observed. Brillouin light scattering spectroscopy was used to find that the exchange constant , spin-wave stiffness , and saturation magnetization are 22.5 pJ/m, , and , respectively. The saturation magnetization value suggests that the Slater–Pauling rule might apply to such nonstoichiometric compositions.
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