Simulation of perpendicular recording on Co-Cr media with a thin Permalloy film-ferrite composite head

Abstract

Numerical analyses of thin film head‐medium system for perpendicular recording are performed using a two‐dimensional model. The formulation is based on Poisson’s equation for magnetic vector potential in the head‐medium system. The following conclusions are drawn: (1) Magneto‐motive force needed for producing a sufficient perpendicular field in the medium is about 1/10 that of the SPT (single pole type) head proposed by Iwaski et al. (2) There is an optimum spacing between the magnetic layer and the ferrite of the head that lies 5–20 times the distance between the main pole and the underlayer. (3) The conductor should be placed in the very tip portion of the magnetic layer. (4) Simulation confirms that recording of densities as high as 100 kBPI is possible using a thin film head‐Co‐Cr medium system.