Patent ID: 7451641

Claim:
A magnetic transduction sensor device, of the type comprising at least one magnetic layer configured to determine a variable magnetisation (MF) in response to the variation of a physical quantity (P, T), wherein said device comprises a plurality of layers arranged in a stack, said magnetic layer configured to determine a variable magnetisation (MF), in response to the variation of a physical quantity (P, T) interacting magnetically through said variable magnetisation (MF) with a free magnetic layer, able to be associated with a temporary magnetisation (MT), said free magnetic layer belonging to said plurality of layers, which further comprises at least one spacer layer ( 13 ) and a permanent magnetic layer ( 12 ) associated to a permanent magnetisation (MP), wherein said physical quantity (P, T) is a pressure (P) and in that said sensor device further comprises a compressible layer and in that said magnetic layer configured to determine a variable magnetisation (M) in response to the variation of a physical quantity (P, T) comprises a layer with high magnetic coercivity, said compressible layer and layer with high magnetic coercivity being associated with said plurality of layer, and wherein said compressible layer is obtained by and comprises a polymer, elastomer or gel, which is compressible by applying a pressure and which behaves in resilient fashion.