Patent ID: 7678585

Claim:
A method of manufacturing a magnetoresistive device, comprising: providing a composite arrangement with a substrate material with a main surface, a metal-insulator arrangement on the main surface of the substrate material, the metal-insulator arrangement including a metal sheet with an insulation area at least partially surrounding the metal sheet, and a magnetoresistive structure on the metal-insulator arrangement; applying a cover layer arrangement on the magnetoresistive structure, so that the cover layer arrangement at least partially covers the magnetoresistive structure with a target thickness D, heating the magnetoresistive structure by exposing the magnetoresistive structure to radiation emitted from a light source with given wavelength λ, wherein the magnetoresistive structure absorbs a portion of the emitted radiation; wherein the absorbed portion of the emitted radiation depends on an actual thickness D′ of the cover layer arrangement and the wavelength λ of the emitted radiation; wherein the target thickness D of the cover layer arrangement is adjusted so that, if in the step of applying the cover layer arrangement a deviation of the actual thickness D′ from the target thickness D in a range of ±20% with reference to the target thickness D occurs for process reasons, a change of the absorbed portion of the emitted radiation in the magnetoresistive structure of less than ±40% is caused; and providing a magnetic field in a desired direction while at least partially cooling down the magnetoresistive structure after the heating of the magnetoresistive structure.