Patent ID: 8189302

Claim:
An extraordinary magnetoresistance (EMR) sensor comprising: a substrate; a graphene layer on the substrate; a ferromagnetic biasing layer on the substrate between the substrate and the graphene layer and having its magnetic moment oriented generally perpendicular to the planes of the ferromagnetic biasing layer and the graphene layer; an electrically insulating underlayer between the ferromagnetic biasing layer and the graphene layer; a pair of current leads in contact with the graphene layer for the injection and extraction of current flowing in the graphene layer; an electrically conductive shunt in contact with the graphene layer through which current flows in the absence of an external magnetic field; a pair of voltage leads in contact with the graphene layer for the detection of a voltage change in response to a decrease in shunted current in the presence of an external magnetic field applied generally perpendicular to the plane of the graphene layer.