A rotating field method was applied to separate linear and quadratic magneto-optic Kerr effects (MOKE) of Fe/GaAs(001) and Fe/MgO/GaAs(001) epitaxial films, and two quadratic MOKE terms could be quantitatively separated. The linear MOKE was independent of crystal orientation, but the quadratic MOKE showed a sinusoidal relationship with a 90° period. The experimental results are fully consistent with theory based on the transfer matrix method.
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