Asymmetric crosstalk of magnetoresistive head

The crosstalk of shielded magnetoresistive (MR) heads with MR films much wider than the recorded track is calculated using a 2D transmission-line model. The head response versus the transverse displacement of head and recorded track can be expressed analytically in the form of a convergent series. Due to the intrinsic asymmetry of the 45° bias in the single domain MR film, the crosstalks from the two adjacent tracks are not equal. As the head is moved away from a positioned track, the crosstalk goes through a null in one direction but not the other. Results from experiments and calculations have been compared and show reasonable agreement. This effect can be employed to test whether the MR film of a shielded MR head is in a single domain state. Furthermore, for high track density applications, the MR head should be offset with respect to the recording head to achieve optimum performance.