Properties of spin-polarized Pt in magneto-optical Co/Pt multilayered films

The magneto-optical and optical properties of the Co/Pt multilayered films (MLF) with a nearly constant Pt sublayer thickness and variable Co sublayer thickness, as well as pure Co and Pt, and Co0.51Pt0.49 alloy films have been investigated in the 1.1-4.7-eV energy range experimentally and by solving the multireflection task for various models of MLF. The comparison between experimental and computer-simulated optical properties of the Co/Pt MLF allowed us to evaluate the thickness of the interfacial regions with the alloyed components. The diagonal and off-diagonal components of the optical conductivity tensor were calculated for the spin-polarized Pt layers in the Co/Pt MLF as well as for the pure Co and Co0.51Pt0.49 alloy films, and the whole Co/Pt MLF. It was experimentally shown that the structural fcc-L1(0) transformation in the Co0.51Pt0.49 alloy film caused by an annealing at 610 K for 240 min leads to significant changes in the optical and magneto-optical properties of alloy.