Abstract
A new analytic perpendicular-recording model for the transition parameter and nonlinear transition shift (NLTS) has been developed. In this model, the Schwartz-Christoffel transformation is used to calculate the demagnetizing field in the medium, combining the effects of the single-pole writer and the soft underlayer. The Westmijze field turned sideways is used to calculate the head field. Both the head field and the demagnetizing field are averaged over the thickness of the recording medium. The Williams-Comstock approach is utilized to determine the transition parameter. Track-edge effects are not included. S/N dependence on the density and the transition width of the isolated pulse (T50) that are calculated from our model agree well with published data. When the write pole image is considered, the calculated NLTS decreases (e. g. from 15% to 10%), but the transition parameter does not change significantly.
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