Electromagnetic sensor element and methods and apparatus for making and using same

摘要

A novel sensor element (30, 30') having unique magnetic properties such that it is capable of producing a sharp response to an alternating magnetic interrogation field, the element (30, 30') comprising a first layer (32, 32') and a second layer (34, 34') of an antiferromagnetic material, wherein the two layers (32, 32'; 34, 34') are magnetically exchange coupled along their length.