The Effect of saturation magnetization and interlayer exchange coupling on the time-evolutional magnetization reversal process in exchange-coupled composite (ECC) media with high coercivity was investigated by utilizing micromagnetic simulation. In order to apply magnetic field, we used magnetic printing. As a result, the magnetization reversal time of the hard layer became shorter as the saturation magnetization of soft layer increased because the magnetostatic field generated from the soft layer increased. Thus, as the saturation magnetization of both layers increased, magnetization reversal occured for the weaker interlayer exchange field.

Abstract. Effect of interlayer exchange coupling on timeevolutional magnetization reversal process in ECC media with high coercivity was investigated by utilizing micromagnetic simulation. In the case of intermediate value of the interlayer exchange coupling, during the application of printing field, magnetization in the soft layer initially reverses and magnetization in the hard layer follows that of the soft layer. Furthermore, after removal of printing field, magnetization in the soft layer is reversed again according with that in the hard layer.

Abstract. Effect of thickness ratio and interlayer exchange coupling on time-evolutional magnetization reversal process in stacked media with high coercivity was investigated by utilizing micromagnetic simulation. Regardless of the layer thickness ratio, for each stacked medium the magnetization reversal process is divided into three regions, namely the spin-flop rotation, the incoherent rotation and the coherent rotation along with increase of the interlayer exchange coupling constant A interlayer . In order to get the incoherent rotation region which is suitable for the recording media, it is required that the A interlayer is between about 1.3×10 -7 and 2.2×10 -7erg/cm for the media with the layer thickness ratio of 1 : 3 and 3 : 1, and that one is between about 1.8×10 -7 and 2.5×10 -7 erg/cm for the media with the ratio near 1 : 1.