Abstract
An integrated biosensor with magnetic tunnel juntions (MTJs) and spin valve (SV) sensor was used for 130nm particle detection. A platform drives an external magnet generating an in-plane dc+ac magnetic field on the sensor at frequencies up to 375Hz, provides a current to bias the sensor, and performs the signal acquisition and treatment. The signal-to-noise ratio of the SV and MTJ was characterized. Bead detection (130nm in diameter) was performed using both sensors leading to a detection limit of 3×108particles∕ml for SV and 3×1010particles∕ml for MTJ.
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