Magnetoresistive Sensors for Biomedical Applications, A Micromagnetic Approach

Structures as Ni80Fe20/Cu/Ni80Fe20 were used to build high sensitivity magnetic field sensors. We discuss, in this paper, the micromagnetic behaviour of these structures for two sensing applications: (i) a micro compass for detection of the position and rotation rate of a micro rotor used to study the dynamics of the biological fluids and (ii) a detection system of the magnetic particles employed in biology as markers or as carriers for targeted drug delivery. The coupling between the magnetic particles and the measurement system was also considered.
Keywords: Thin Films; Giant Magnetoresistance (GMR); Planar Hall effect; Magnetic detection