A head includes first and second read modules. The first module has an MR element formed on a wafer having a grating directed along a first direction. The magnetization of the first module element is directed along the first direction. The first module element is biased with a first current directed along a direction such that magnetically stable operation of the element results, that is along an opposite second direction. The second module has an element formed on a wafer having a grating directed along the first direction. The second module is flipped respect to the first module such that the grating is directed along the second direction. The magnetization of the second module element is directed along the second direction. The second module element is biased with a second current directed along the direction opposite to the first current, i.e., the second current is directed along the first direction.

 
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