Patent ID: 7486475

Claim:
A magnetic data system, comprising: at least one reader formed above a substrate, the at least one reader further comprising a shield and a magnetoresistive (MR) sensor; a first circuit for setting a voltage (Vsub) of the substrate to about a voltage (Vshield) of the shield of the at least one reader; a second circuit coupled to the at least one reader for setting a voltage (Vshield) of the shield to about a voltage of the MR sensor; and a bias circuit coupled to the at least one reader for passing an MR bias current through the MR sensor thereof, wherein the bias circuit of the at least one reader includes a first bias resistor positioned between a current source and the MR sensor and a second bias resistor positioned between the MR sensor and a ground, wherein resistance values of the bias resistors are adjustable for adjusting the Vshield of the at least one reader to about match the Vsub.