Erase band width evaluation by phase coherency

Abstract

As the track density increases, the properties of the erase band and track edge become more and more important. In this study, we report on a pertinent erase band measurement method, based on a magnetic force microscope, to characterize the erase bands and track edge overwrite properties resulting from the write-head fringe field in a precise manner. The erase bands of written tracks were measured by using the proposed technique, the so-called phase coherency method, for both longitudinal recording tracks and perpendicular tracks in comparison to the amplitude technique.