Influence of the Spacing between Master and Slave Media on Magnetic Contact Duplication Characteristics

In the patterned master magnetic contact duplication technique, the spacing between master and slave media seriously affects the duplication characteristics. When a slave medium with coercive squareness S* of 0.43 was duplicated by using a master medium with a pattern width L of 2.5 μm and a magnetic layer thickness of 1 μm, it was found from experiments and simulation that the spacing loss factor K is about 30 dB. The reason for this small value is that the recording demagnetization in the duplication process is very weak. It is shown by simulation that a higher S* value in slave media is advantageous for the patterned master magnetic contact duplication.