▎ 摘　　要

NOVELTY - The sensor has a set of electrodes connected with a layer of n-graphene to supply a current through the layer of n-graphene and to measure a voltage change in response to the presence of a magnetic field. A gate electrode is separated from the n-graphene layer by a non-magnetic, electrically insulating material, and located between the layer of n-graphene and a surface. The layer of graphene layer includes dimensions to detect a magnetic bit to be sensed, where the n-graphene layer consists of a single layer of graphene. USE - Tunable Lorentz magnetoresistive magnetic field sensor for use in a data recording system such as magnetic disk drive system. ADVANTAGE - The gate electrode alters the electrical resistance of the graphene layer using a gate voltage to control the sensitivity and speed of the sensor. The gate electrode can act as a shield to prevent stray electric fields from affecting the n-graphene layer. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a magnetic data recording device. Disk drive (100) Rotatable magnetic disk (112) Slider (113) Spindle (114) Disk drive motor (118)