Magnetic Contact Duplication Using Lithographically Patterned Master Medium.

A magnetic contact duplication technique using a lithographically patterned master medium was investigated in order to write a servo signal on hard disks and floppy disks at high speed and low cost. In this technique, the coercivity of the master medium is low, and a dc magnetic field is applied to a slave medium in contact with the master medium. Experimental and computer simulation results show that the degree of magnetic duplication becomes better and then saturates as the magnetic layer thickness of the master becomes thicker. Magnetic duplication performance improves with the increase of Ms of the master.