AIP Digital Archive
Calculations on temperature distributions in a multilayer thin-film stack of a disk as used in optical recording are discussed. It is shown that an analytical solution of the heat equations can be obtained if certain realistic approximations are applied. The analytical solution is compared with numerical calculations on the heat equations, and for the cases investigated, a good agreement is obtained: If the active layer of an optical disk has a high(er) diffusivity with respect to the protective layer and the substrate, the analytical expressions obtained predict maximum temperatures in the active layer, correct to within a few percent, and accurate trends for a variety of problems. Results of numerical and analytical calculations are shown in detail for a realistic magneto-optical thin-film stack, and some general trends are discussed. If only the temperature distribution in the active layer is of interest, an enormous reduction of the calculation time can be achieved, important in write-strategy calculations, for instance.
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