MR Read Head Design
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
A compensating design pattern and biasing technique is shown to achieve common-mode noise rejection in a magnetoresistive (MR) head element. A pseudo MR device is included between the contact pads to the MR head. The pseudo MR device is connected as one leg of a bridge network with two external matched resistors and the MR head element. The bridge network is connected across a power supply with the output of the MR stripes connected to an operational amplifier. The figure shows a standard single-ended MR read element 10 with its one sense leg 11 and a common leg 12. A tapped MR compensating device 13 is stagger recessed from the lapped stripe height shown at line 14. The MR compensating device 13 can occupy almost the entire area to the MR read element of the next track.