Finite element model of giant magnetoresistance (GMR) based sensors for microfluidic applications

The design of novel Lab-on-Chip (LOC) devices for Point-of-Care Testing (POCT) demands the development of multiphysics-based models taking into account the different involved phenomena, in a global approach. We are here proposing a finite element method (FEM, based on COMSOL) model of a magnetic microparticle-tracking device. The considered device includes a giant magnetoresistance (GMR) sensor composed of a linear array of 8x1 elements, attached to a microfluidic channel. The model takes into account the magnetic field generated by the particles, their position in the channel, and the magnetoresistance phenomena induced in the sensing elements. Preliminary results using a millimeter-scaled 3D printed fluidic channel and spherical magnets are presented, so demonstrating the proper performance of the model.