Abstract
The optimisation of magneto-optical data storage disk structures requires a knowledge of the optical and magneto-optical constants of the storage material. In this paper we present the optical (n + ik) and first order magneto-optical (Q1 + iQ2) constants for the rare earth-transition metal alloys: Tb23.5Fe72.5Co4.5, (Tb23.5Fe72.5Co4.5)89Pr11, Dy22Fe68.5Co9.5 and Dy28Fe52Co20. A combination of Kerr polarimetry and ellipsometry is used to evaluate these constants, which are then used to calculate the magneto-optic response as a function of magnetic layer thickness. A comparison between calculated and measured Kerr responses from both the air and substrate side of these structures reveals the self consistency of the modelling process and the validity of the determined constants.
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