| 摘要 |
PROBLEM TO BE SOLVED: To obtain a medium having excellent weatherability and the excellent characteristic to repeat recording and erasing of information signals by providing the medium with protective layers consisting essentially of Ge nitrides or Ge nitrooxides contg. >=1 kinds of specific elements and bringing the layers into contact with at least one of a recording film. SOLUTION: This medium is provided with the diffusion preventive layers 7, 8 across the recording layer 3. These layers are formed of materials consisting essentially of GexN or GeXON in which X includes at least one elements among Ti, V, Cr, Mn, Cu, Zn, Zr, Mg, Mo, Pd, Ag, Cd, Hf, Ta, W and C. As a result, the diffusion preventive layers 7, 8 are basically the Ge nitrides or Ge nitrooxides which, unlike the nitrides, such as boron nitride, aluminum nitride and silicon nitride, suppress the migration of the constitution elements of the recording layer 3 and improve the adhesion property to the recording layer 3 as well. The range of the average compsn. ratio of the Ge.X to be incorporated into the layers is preferably <=50% and 10 to 30% of X with respect to Ge. |
