Optical properties of magnetic quasi-2D nanocomposites in the IR spectral region |
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| Authors: | A N Drachenko A N Yurasove I V Bykov E A Gan’shina A B Granovskii V V Ryl’kov D V Smirnov J Leotin B Dieny |
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| Institution: | (1) LPMC and SNCMP, Complexe Scientifique de Rangueil INSA, 31077 Toulouse Cedex, France;(2) Moscow State University, Vorob’evy gory, Moscow, 119899, Russia;(3) Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 117975, Russia;(4) Russian Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia;(5) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(6) CEA/Dep. de Recherche Fondamentale sur la Matiere Condensee, 38054 Grenoble, France |
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| Abstract: | The optical absorption spectra of magnetic quasi-2D Co island films and of hybrid Co/SiO2 multilayers in which island films are separated by SiO2 layers were studied. It was found that, when the Co film was masked by a thin SiO2 layer, the absorption considerably increased and exceeded 0.8. This was observed when the Co fraction was substantially lower than its critical value for the percolation transition. Moreover, the maximal absorption in this case weakly depends on both the effective film thickness and the number of Co layers. Numerical analysis shows that the observed peculiarities of the absorption spectra of the structures based on quasi-2D granulated Co films are connected to a great extent with the peculiar features of the interference effects occurring in such systems. |
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