Abstract
Bilayers Fe/Au-Cu and Fe/Ag-Au made by vacuum evaporation were studied. The magneto-optical polar Kerr rotation and reflectivity spectra were measured in the region from 400 to 700 nm. In the magneto-optical Kerr rotation spectra of bilayers Fe/Au-Cu and Fe/Ag-Au with the thickness of Fe layer less than the light penetration depth, there is a broad enhancement of the magneto-optical polar Kerr rotation with a Kerr peak near the plasma edge in the reflectivity spectra of Au-Cu and Ag-Au alloys. The peak shifts toward the long wavelength side with increasing Cu and Au content in Au-Cu and Ag-Au alloys, respectively. Our results show that the composition of the reflector in our bilayer structures can shift the wavelength range of the magneto-optical Kerr rotation enhancement. Interpretation and discussions are given.
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