Low bias current paired magnetoresistive head with misaligned anisotropy axes

Abstract

A magnetoresistive head assembly comprising: a paired magnetoresistive head including first and second magnetoresistive elements, and having a first electrically insulating spacer located between the elements; the first and second magnetoresistive elements being of nominally identical thickness, geometry, magnetic and electrical properties, with the exception that easy-axis of uniaxial anisotropy (excluding shape anisotropy) of the first MR element, is oriented at a first, substantially nonzero angle with respect to the geometrically defined longitudinal axis of the MR elements, and is substantially nonparallel to the easy-axis of uniaxial anisotropy (excluding shape anisotropy) of the second MR element, the easy-axis of uniaxial anisotropy of the second MR element being oriented at a second, substantially nonzero angle with respect to the geometrically defined longitudinal axis of the MR elements; means for making electrical contact to, and supplying a parallel bias current of nominally equal amplitude through both of the MR elements; and means for sensing the difference in voltage across the first and second MR elements.

Dependencies are inferred from the claim text.