Patent ID: 8300366

Claim:
A magnetic storage device, comprising: a slider body made of a semiconductor material, the slider body including a top semiconductor layer and a bottom semiconductor layer; a magnetic head carried on the slider body; a read head portion of the magnetic head which includes a three terminal magnetic sensor having three terminals; the three terminal magnetic sensor being configured for reading, at a magnetic field sensing plane, magnetic signals from magnetic media of the magnetic storage device; the three terminal magnetic sensor including: a base region; an emitter region; a collector region which is the top semiconductor layer of the slider body and composed of the semiconductor material of the slider body; the base region comprising magnetic materials and being formed in between the emitter and the collector region; a base lead in contact with the magnetic materials of the base region; an emitter lead in contact with the emitter region; a collector lead in contact with the top semiconductor layer of the slider body; the base lead, the emitter lead, and the collector lead forming the three terminals of the three terminal magnetic sensor; a first barrier region formed between the base region and the emitter region; a second barrier region formed between the base region and the collector region; and an insulator layer which separates the top semiconductor layer of the slider body from the bottom semiconductor layer of the slider body, for electrically isolating at the magnetic field sensing plane the collector region from the bottom semiconductor layer of the slider body, so as to effectively eliminate a capacitance otherwise present between the collector region and the magnetic media.