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The influence of saturation magnetization of a master disk on its perpendicular magnetic contact duplication characteristics was investigated by using the two-dimensional finite element method. An investigation of bit printing (where the duplication field is applied in a direction perpendicular to the disk plane) and edge printing (where the duplication field is applied in an in-plane direction), revealed the following points. In bit printing, the influence of saturation magnetization of a master disk on perpendicular duplication characteristics is very small when the duplication field is nearly equal to the coercivity of the slave (4 kOe), which is the optimum field. On the other hand, in edge printing, the duplication characteristics are better for high saturation magnetization of a master disk than for low saturation magnetization. The cause of this difference in the influence of saturation magnetization of a master disk is the demagnetizing field of the master. In bit printing, the influence of saturation magnetization of a master disk is small because of the high demagnetizing field coefficient, while in edge printing, the influence of saturation magnetization of a master disk is large because of the low demagnetizing field coefficient.

Influence of Saturation Magnetization of a Master Disk on Its Perpendicular Magnetic Contact Duplication Characteristics