Patent ID: 6678127
Filing Date: 2004-01-13
Classification: B82Y,G11B,Y10T

Abstract:
A combination comprising:a read head including: a read sensor; first and second lead layers connected to the read sensor; nonmagnetic insulative first and second read gap layers with the read sensor and the first and second lead layers being located between the first and second read gap layers; ferromagnetic first and second shield layers with the first and second read gap layers being located between the first and second shield layers; the first read gap layer having a resistance RG1 between the first shield layer and one of the first and second lead layers and the second read gap having a resistance RG2 between the second shield layer and said one of the first and second lead layers; a plurality of resistors connected between a first node and each of the first and second shield layers wherein the plurality of resistors includes at least first, second and third resistors RS1, RS2 and RS3 and the first node is connected to said one of the first and second lead layers; a second node located between the first and second resistors RS1 and RS2and between the first and third resistors RS1 and RS3; the second resistor RS2 being connected between the second node and the second shield layer; the third resistor RS3 being connected between the second node and the first shield layer; and an operational amplifier having first and second inputs connected to the first and second nodes respectively so as to be across the first resistor RS1 and an output connected to the second node for maintaining the first and second nodes at a common voltage potential.