| 摘要 |
PURPOSE:To obtain excellent recording sensitivity by specifying the temp. conductivities of films to sandwich a recording medium film to serve as an optical memory element to specific values. CONSTITUTION:This magneto-optical recording medium is formed by sandwiching the recording medium film to serve as the memory element between the two layers, at least one of which is a transparent dielectric film. The respective temp. conductivities, designated as a=K/(c.rho), (K: heat conductivity, c: specific heat, rho: density) are so determined as to attain >=5X10<-3>cm<2>/sec and <=3X10<-1>cm<2>/sec. With magneto-optical recording, the recording sensitivity is higher as the heat by laser light is more liable to accumulate in the recording medium. The heat conductivity is, therefore, preferably <=3X10<-1>cm<2>/sec. The energy of the laser light fails to arrive at the recording medium if the temp. conductivity is too low. The heat is substantially transferred to the recording medium film and the excellent recording sensitivity is obtd. if the temp. conductivity is >=5X10<-3>cm<2>/sec in this regard. |
