Influence of Master Pattern Angle against Hard Magnetization Direction of Slave Medium on Magnetic Duplication Characteristics

Magnetic contact duplication is proposed as a method for forming phase servo patterns on hard disks. In a phase servo pattern, the magnetic field used for duplication is applied diagonally across the master pattern. This work clarifies the influence of the master pattern angle θ against hard magnetization direction of the slave medium on the magnetic duplication characteristics. In the case where θ= 30°, the output signal voltage decreases and the half-value width of the signal becomes broad compared with that for θ= 0°; that is, the magnetic duplication characteristics deteriorate as θ increases. Even if the duplication field is made strong for large θ, the magnetic duplication characteristics are not improved.