Analytic analysis of a dual magnetoresistive head

A recently proposed dual magnetoresistive (DMR) reproduce head, consisting of two identical, adjacent MR stripes separated by a nonmagnetic spacer and connected electrically in parallel, was shown to have potential in very high density magnetic recording applications. The present work considers the micromagnetics of this coupled layer device, and derives approximate analytical expressions for the expected signal output as a function or in-track recording density. The results are found to be in good agreement with numerical computations based on reciprocity. Comparison with analytical results for other MR head configurations is discussed.