| 摘要 |
The appts. for providing a position signal that indicates the cross-track position of a magnetic head relative to a selected magnetic track, has a first magneto-resistive (MR) element in the head to sense a portion of the recorded information, the element having a longitudinal direction. A second MR element in the magnetic head, insulated from the first MR element, senses the same cross-track portion of the magnetic track, and also has a longitudinal direction. A current source applies a biasing current for and produces an output signal from each MR element, the two biasing currents rotating the magnetisation of the MR elements in opposing directions, that are transverse from their respective longitudinal directions. A position decoder manipulates the output signals to establish the position signal. An electrically insulating layer such that the two MR elements are fabricated on opposite sides of the electrically insulative layer. The two MR elements are parallel and equal in dimensions to each other. Each biasing current flows along the longitudinal direction of its corresp. MR element, and the two biasing currents are in the same direction. |
