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An analytical model is developed for calculating the cross-track correlation length in a perpendicular recording system, including both the medium inter-granular exchange and the magnetostatic interactions. For a typical range of parameters in current perpendicular recording systems, the cross-track correlation length varies from about 0.7-0.9 of the average grain diameter:at zero exchange, to about 2-3at a strong exchange field of 0.1H/sub K/. The relation with jitter noise is also investigated.
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Jin et al. (2003) studied this question.
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