Influence of Soft-Under-Layer in Perpendicular Media on Magnetic Contact Duplication Characteristics

In this study, the influence of soft-under-layer (SUL) on duplication characteristics was investigated. The magnetic field distributions around a slave medium were calculated. In the case of perpendicular field application (PFA), influence of SUL on duplication characteristics doesn't almost change even though duplication field strength increases. On the other hand, in the case of in-plane field application (IFA), the influence of SUL on duplication characteristics is negligible even though a duplication field strength increases. The influence of SUL on duplication characteristics becomes smaller for ultra-high density perpendicular recording.