MAGNETIC RECORDING CARRIER USING TB-GD-FE

摘要

The vertical magnetic recording medium can obtain high quality of S/N ratio by eliminating grainboundary noise from polycrystal medium and also can obtain desirable Curie point, depending on not solid solubility but composition change only. The medium is made of steps: depositing ZnS 1000A0thick on the PMMA substrate 1400mm diametric, 2,5mmthick. by vaporization ; depositing Tb-Gd-Fe thin thickness of 150-200A on the ZnS deposited substrate by RF-sputtering. Coercive force of Tb-Gd-Fe is 1K Oe and Curie point of it is 1200. And also the composition of Tb+Gd is composed of 0.22-0.32 at %.