Analysis of a dual magnetoresistive head

A 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 authors consider the micromagnetics of this device and derive approximate analytical expressions for the expected signal output as a function of linear recording density. The expression for the intrinsic reproduce sensitivity vs. recorded density, when including a proposed correction to account for the energy of traditionally neglected edge fringing fields, are shown to be in good agreement with more exact numerical results. The same form of equations is shown to be useful for deriving, via reciprocity, analogous and reasonably accurate analytical results for the shielded MR head