Patent ID: 8514608

Claim:
A spin transfer torque memory apparatus comprising: a bipolar select device comprising: a semiconductor substrate having a first side and an opposing second side; a plurality of collector contacts disposed in the first side of the of the semiconductor substrate, wherein each collector contact is electrically isolated from each other; an emitter contact layer disposed in the second side of the semiconductor substrate, the emitter contact layer being electrically coupled to a source line; and a base layer disposed between the plurality of collector contacts and the emitter contact layer, the base layer being electrically coupled to a word line; and a plurality of spin transfer torque memory cells, wherein one of the plurality of spin transfer torque memory cells is electrically coupled to one of the plurality of collector contacts and a bit line associated with the one of the plurality of spin transfer torque memory cells, wherein the base layer and the emitter contact layer provides an electrical path for the plurality of collector contacts.