Miniature magnetic core, sensor comprising same and method for manufacturing same

US8085039B2 · kind B2 · utility

Assignee

• COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventors

• Helene Joisten · Grenoble, FR
• Robert Cuchet · Le Pont-de-Claix, FR
• Bernard Viala · Saint-Égrève, FR
• Marcel Audoin · Saint-Égrève, FR
• Rachid Hida · Cras, FR

Key dates

• Filing date: Dec 11, 2006
• Grant date: Dec 27, 2011
• Expiry date: Apr 28, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/05
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

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