Patent ID: 7759933

Claim:
A magnetic amplification device comprising: a magnetic sensor (C m ) of the anisotropic magnetoresistance (AMR), giant magnetoresistance (GMR), tunnel magnetoresistance (TMR) or giant magnetoresistance (GMI) type, the sensitivity to the magnetic field of the device being in the transverse direction, wherein dimensions of the magnetic sensor are of the order of a few millimeters along the directions Dx and Dy and a few hundred microns in thickness; and a first longitudinal piece of magnetic material and a second longitudinal piece of magnetic material, each of the pieces of magnetic material having a longitudinal slot in and extending through one end of the longitudinal piece of magnetic material, the one end of the first longitudinal piece being separated from the one end of the second longitudinal piece by a gap of predetermined length; wherein the longitudinal slot of the first piece of magnetic material is opposite the longitudinal slot of the second piece of magnetic material and the magnetic sensor is disposed in the gap between the first and second pieces of magnetic material and within the longitudinal slot of the first piece and the longitudinal slot of the second piece.