rs(GdFeCo/TbFeCo) were prepared by sputtering method.The magnetization transition caused by temperature changes has been investigated by the hysteresis loops and the Kerr rotation hysteresis loops.The results indicate that the magnetization direction of readout layer changes from in-plane to perpendicular with temperature increaseing.The films have the basic properties of the CAD-MSR disks.The transition occurs mainly as a result of the changes in the saturation magnetization.When the temperature is increased to the compensation temperature,the saturation magnetization and the demagnetizing energy of the GdFeCo layer decrease,with the exchange-coupled interaction,the magnetization direction of readout layer changes from in-plane to perpendicular.Magneto-optical recording;Magnet