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The nonlinear magneto-optical response of a magnetic metal as a function of the thickness of a noble metal overlayer shows that an oscillatory behavior dominates the total generated second harmonic output. The oscillation periods are approximately twice as large than those observed with linear Kerr effect measurements or estimated from the Fermi surface. The spectral dependence of the signal indicates that the thickness independent background is due to interband transitions while the oscillatory part persists at lower photon energies.

QUANTUM WELL STATES IN NOBLE METALS: A SECOND HARMONIC GENERATION STUDY