Patent ID: 7203036
Filing Date: 2007-04-10
Classification: B82Y,G01R

Abstract:
1. An extraordinary magnetoresistance (EMR) sensor comprising: a substrate; a first layer of semiconducting material having a first band-gap formed on the substrate, a second layer of semiconducting material formed on top of the first layer and having a second band gap smaller than the first band gap, and a third layer of semiconducting material formed on top of the second layer and having a third band gap greater than the second band gap; said first, second and third layers forming a quantum well and said second layer being the EMR active layer responsive to a magnetic field generally perpendicular to said second layer; a shunt region of electrically conductive material on top of said third layer and extending perpendicularly through said third layer into electrical contact with the EMR active layer; and at least four lead regions on top of said third layer and extending perpendicularly through said third layer into electrical contact with the EMR active layer.