초록 ▼

A disk drive system having a magnetoresistive (MR) sensor having four leads, two leads for providing sense current to an MR layer and two leads for providing current to a soft adjacent layer (SAL). The MR layer as well as the hard bias layers are electrically insulated from the SAL by an insulator.

A disk drive system having a magnetoresistive (MR) sensor having four leads, two leads for providing sense current to an MR layer and two leads for providing current to a soft adjacent layer (SAL). The MR layer as well as the hard bias layers are electrically insulated from the SAL by an insulator. The voltages developed across the MR layer (voltages due to the presence of thermal asperities and voltages due to the presence of data fields) and the SAL (voltages due to the presence of thermal asperities) are applied to the inputs of a differential amplifier for substantial elimination of the thermal asperity signal.

대표청구항 ▼

[ We claim:] [1.] A magnetoresistive (MR) sensor, comprising:an MR element, said MR element including an MR layer, a spacer, and a soft adjacent layer (SAL), said MR layer separated from said SAL by said spacer;first and second hard bias layers separated from each other by said MR element, said firs

[ We claim:] [1.] A magnetoresistive (MR) sensor, comprising:an MR element, said MR element including an MR layer, a spacer, and a soft adjacent layer (SAL), said MR layer separated from said SAL by said spacer;first and second hard bias layers separated from each other by said MR element, said first and second hard bias layers forming contiguous junction with said MR element;an electrical insulator;an asperity compensation layer (ACL) separated from said MR element and said hard bias layers by said electrical insulator;first and second MR leads disposed over said first and second hard bias layers for providing sense current to said MR element; andfirst and second ACL leads disposed over said ACL for providing current to said ACL.