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A new protective film, Tb-SiO2, was developed to increase the lifetime of TbFeCo magneto-optical disks. Since Tb, a rare-earth metal, is quite easily oxidizable, an efficient protective layer is essential to assure the stability of magneto-optical disks. Given that vacuum-deposited SiO2 film acts as an oxidation-inducing layer, unlike SiO2 on a thermally oxidized silicon wafer, we invented a new protective film, Tb-SiO2, in which Tb is intended to trap active oxygen in the vacuum-deposited SiO2. The results were excellent and we estimate the lifetime of TbFeCo disks with Tb-SiO2 as an underlayer and overlayer, at more than 20 years at 40 °C, 90% relative humidity. The properties and protection effects of Tb-SiO2 are described.
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Miyazaki et al. (1987) studied this question.
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