Magnetic field-induced enhancement of longitudinal Kerr effect in Co/Cu(111) multilayer films

The study into the behavior of longitudinal magneto-optical Kerr effect in the Co/Cu(111) multilayer films prepared by the magnetron sputtering method displayed its multiple field-induced enhancement at certain Cu layer thicknesses providing an extreme exchange coupling between the Co layers. It is supposed that this phenomenon results from a considerable contribution of the Co/Cu interfaces to the magneto-optical effect and is caused by the paramagnetism of conductivity electrons in the Co/Cu interfaces, enhanced by the hybridization of electron sp and d bands of copper and cobalt. The periodicity of the magneto-optical susceptibility enhancement is supposed to be due to the hybridization sensitivity to the quantum size effect in the Cu layers.

PACS: 75.70.–i Magnetic multilayers;
PACS: 78.20.Ls Magneto-optical effects;
PACS: 75.75.–n Optical properties of nanostructures.

Key words: magneto-optical Kerr effect, magnetic multilayer, enhancement of magneto-optical effects, Co/Cu.

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