A novel magnetic contact duplication technique for servo-writing on magnetic disks

A novel magnetic contact duplication technique is proposed in order to writ e a servo signal on hard disks and floppy disks at a high speed and a low c ost. In this technique a magnetic laver of a master disk is lithographicall y patterned in accordance with a servo signal, having low coercivity, and d e magnetic field is applied to a slave disk contacted with the master one. A computer simulation using finite element method shows that the pattern of the master disk can be duplicated on a slave one. The possibility of dupli cation by using this technique is confirmed from experimental results in wh ich a Bitter pattern of a duplicated slave medium is clearly observed.