Magneto-optical disk

A magneto-optical disk, comprising:

• beginning at a light incident side of the disk for recording and reproducing, a transparent base plate, a first protective dielectric layer formed of nitride in abutting contact with the base plate, an amorphous magnetic recording layer having perpendicular magnetic anisotropy directly following and in abutting contact with the first protective layer, a second protective dielectric layer formed of a nitride directly following and in abutting contact with the recording layer, and a reflective metal layer directly following and in abutting contact with the second layer and formed of aluminum which is electrochemically less noble than said recording magnetic layer;
• said recording magnetic layer being a magnetic layer mainly comprising TbFeCo and having a film thickness of not less than 180 .ANG. and not more than 260 .ANG., and a Curie point of the magnetic layer being not lower than 170.degree. C. and not higher than 220.degree. C.;
• said first protective dielectric layer being formed of an element selected from the group consisting of silicon nitride or aluminum nitride and having a product of a refractive index and a film thickness thereof of not less than 0.2 and not more than 0.35 times a wavelength of laser light employed, the wavelength being the same for recording and reproducing;
• said second protective dielectric layer being formed of an element selected from the group consisting of silicon nitride or aluminum nitride and having a product of a refractive index and a film thickness thereof of not less than 0.1 and not more than 0.15 times the wavelength of the laser light employed;
• said reflective metal layer having a film thickness of not less than 500 .ANG. and not more than 1000 .ANG. and a reflectivity at a boundary with the second protective dielectric layer of not less than 70%;
• and
• an organic protective film being formed on the reflective metal layer.