MINIATURE MAGNETIC CORE, SENSOR COMPRISING IT AND METHOD FOR MANUFACTURING IT

摘要

The miniature magnetic core comprises at least one bar magnet (12) having, in the demagnetized state, a plurality of magnetic domains separated by magnetic walls, said bar magnet (12) having permanent discontinuities (21) placed at least approximately at the probable locations of at least some of these magnetic walls in the absence of these permanent discontinuities (21). The miniature sensor comprises a miniature core (11) that cooperates with at least one excitation coil (13) and at least one detection coil (14). The method for manufacturing the magnetic core comprises: the step of identifying the probable location of the magnetic walls; the step of depositing at least a thin film of magnetic material on a support in order to form said core; and the step of producing, in said core, discontinuities (21) approximately at the identified locations of said walls.