Long Life Magnetoresistive Head
Original Publication Date: 1981-Nov-01
Included in the Prior Art Database: 2005-Feb-12
Magnetoresistive (MR) head 10 includes a primary MR sensing device 11 and one or more secondary sensing devices 12, connected in parallel between gold leads 13 and 14. For a new head, the flying height 15 of device 11 is such that device 11 is saturated by the magnetic field presented from the media to the head 10. The flying height 16 for secondary device 12 is such that device 12 is partially magnetized when head 10 is new. The partial magnetization of device 12 causes that device to develop a resistance change signal of some magnitude, along with the primary device 11. The resistance change in device 12 tends to offset the signal division resulting from the parallel circuit.