| 摘要 |
<p>A magnetooptical recording medium wherein a multilayered thin-film structure is optimized to control optical phase difference of the medium in order to maintain a high S/N ratio. This structure is obtained by stacking on a transparent substrate at least a first protective film of a thickness of 400 to 700 Å, a recording film of a thickness of 150 to 300 Å, a second protective film of a thickness of 150 to 250 Å, and a reflective film of a thickness of 400 to 800 Å. Each of the first and second protective layers is suitable one composed of AlSiN, SiN or SiO2 having a refractive index of 1.95 to 2.05. The recording layer is suitably one composed of NdxDyy(FeCo)100-x.y or Ndx(DyTb)y(FezCo1-x)100-x.y and satisfying the following relationship: 25 at % « x + y « 30 at %, 0 at % « x « 8 at %, 0.07 at % « z « 0.43 at %.</p> |
