Overwrite performance for high-coercivity particulate media

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Abstract
A model of overwrite based on anisotropy field distributions of particles has been proposed for γFe2O3 and Co‐γFe2O3 high‐coercivity particulate media. In this model, overwrite is determined by the ratio of the number of nonreversed particles to the total number of particles. The magnitude and angle distributions of the anisotropy field were obtained by torque magnetometer measurements. From these observed distributions, switching field distributions of the particles were derived using the curling model for an infinite cylinder. The write field of thin‐film heads was calculated using a finite element method. The nonreversal ratio in the medium was given by both the switching and the write fields. The calculated overwrite values were obtained from this ratio and were found to be in good agreement with the measured ones. This model was valid for the media which differed in the distributions of the anisotropy field. The overwrite performance can be improved by narrowing the anisotropy field distributions of the particles in the media.

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