公开(公告)号：JPH03242843A

公开(公告)日：1991-10-29

申请号：JP32342990

申请日：1990-11-28

Applicant: IBM

Inventor： KURISUTOFUA BINSENTO JIYONISU ,  FURECHIYAA JIYONZU ,  JIYOSEFU SUKINAA ROOGAN ,  MAIKERU AREN RUUZATSUKU

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE: To make it possible to obtain a magneto-optical memory medium improved in a signal-to-noise ratio and environmental stability by incorporating specific synthetic oxide glass into dielectric layers. CONSTITUTION: This magnet optical memory medium is formed by laminating a first plastic layer 12, the first dielectric layer 14, a magneto-optical material thin-film layer 16, the second dielectric layer 18 and a protective layer 20 on a substrate 10. The dielectric layers 14, 18 contain the synthetic oxide glass. The glass has the chemical formulas SiO2 -MO3 or SiO2 -MO3 O3 and SiO2 -MO3 O5 . M is selected from Zr, Ti, Al, Nb, Y, Sn, In, Ta or Sb and more particularly M is preferably Ti, Zr or Al. As a result, the signal-to-noise ratio and environmental stability are improved.