Abstract
The magneto-optical Kerr effect enhancement in Co y Ag 1 , granular magnetic films anncaled at 100, 250, 400, 500 °C was studied. The optical constants the complex dielectric function and magneto-optical Kerr patameters were measured at room temperature. For the sample Co 2 Ag 98 , strong Kerr effect enhancement is observed around the Ag plasma edge. With increasing annealing temperature. the values of the kerr rotation θ k and Kerr ellipticity e K increase, resonance-like peaks appear in the Kerr rotation, and the peak positions are shifted toward the low photon energy region. As the Co composition x inereases the Kerr effect enhancement is weakened and disappears for x ≥ 50%. From the analysts of the experimeatal data, it is concluded that the magnetooptical Kerr effect enhancement is due to the presence of the steep plasma edge.
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