Exchange coupled double-layered TbFeCo films, which consist of a transition-metal dominant 1st layer and a rare-earth dominant 2nd layer, are found to be a high performance medium for an erasable optical memory disk. In this paper, we have studied the dependence of recording characteristics on the magnetic properties of each layer. The temperature dependence of switching fields of each layer was measured by Hall effect, and the change in magnetization process with temperature was discussed. It is suggested that the recording noise of large Hc1 (coercive force of the 1st layer) film at lower write power results from a difference of the magnetization process on recording temperature.
