Modified effective-medium theory for magneto-optical spectra of magnetic materials
نویسندگان
چکیده
We have modified the Bruggeman effective-medium theory ~EMT! to study the microstructural dependence of the magneto-optical spectra in magnetic materials having the off-diagonal elements of the dielectric tensor. To verify the modified theory, optically thick ~4-Å Co/9-Å Pt!77 multilayers were prepared at various Ar sputtering gas pressures of 2, 10, and 30 mTorr. The modified effective-medium theory was confirmed to match well with the experimental values of the dielectric tensors of Co/Pt multilayers. We have also applied this modified EMT to a 20-Å-thick Co film having island structure and observed that this modified EMT exhibited a better match to the experimental data than any other existing theories. @S0163-1829~97!01109-0#
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