| 摘要 |
PURPOSE:To obtain a magnetooptical recording medium having a larger signal to noise ratio and excellent shelf life by forming the magnetic recording layer of a thin film dispersed with >=1 kind of transition metals and >=1 kind of metallic elements such as rare earth elements into a dielectric material and having the axis of easy magnetization perpendicular to the film plane and forming a reflective film on one side of the magnetic recording layer. CONSTITUTION:The magnetic recording layer is formed by dispersing the metallic elements of >=1 kind of transition metals such as Fe, Co and Ni or the metallic elements of >=1 kind of the rare earth metals such as Gd, Tb and Dy in >=1 kind of the dielectric materials selected from the group consisting of AlN, Si3N4, MgF2, BiF3, SiO, SiO2, TiO2 and Ta2O5. The volumetric packing of the rare earth or transition metals is preferably 50-95% by the volume of the magnetic recording layer. The optimum film thickness is usually 250-1,000Angstrom although said thickness varies with the kinds of the rare earth or transitio metals and the packing. The reflective film is preferably formed by using a material such as Au, Ag, Cu or Al to 300-800Angstrom film thickness and by a method such as an electron beam vapor deposition method. |
