The dispersion of the material parameters of the recording media, such as grain size, inter-grain exchange constant and the anisotropy field, can be considered to be the source to decrease the media SNR of the magnetic recording system. The effect of the grain size dispersion have been studied for the longitudinal recording system, but the effect should be changed in the perpendicular recording system. The exchange coupling between grains is considered to increase the media SNR and thermal stability in the perpendicular recording system [1,2]. Because the thicknesses of the grain boundaries are not constant in the actual recording media, the exchange constant should not be constant. In this paper, we investigate the dispersion effect of grain size, exchange and anisotropy on the read/write properties by computer simulation.
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