The results from a finite-element analysis of perpendicular magnetic recording are presented. The mechanism responsible for a striking improvement of recording and reproducing sensitivity by the addition of a Ni-Fe soft magnetic underlayer to the Co-Cr medium is described. We have calculated the flux flow for perpendicular recording using a main pole/auxiliary pole head. In the presence of an underlayer, flux density in the main pole is enhanced about ten times in both the recording and reproducing processes. Another feature of the auxiliary-pole-driven head with double-layer media is that flux density is highest at the tip of the main pole. Results for main pole flux as a function of head to medium spacing are also presented.
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Tanabe et al. (1985) studied this question.
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