Magnetic biochips: a new option for sensitive diagnostics

We present an overview of miniaturized biosensor devices based on the sensitive detection of magnetic nanoparticles using the giant magneto-resistance effect. This detection principle has advantages over established methods, and the sensitivity is promising. In our opinion, the challenge is now in the integration—of sample pretreatment, in a cartridge, of nanoparticles with proper stabilization, magnetic properties, and surface functionalizations