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Detection of 130 nm magnetic particles by a portable electronic platform using spin valve and magnetic tunnel junction sensors

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8 Author(s)
Cardoso, F.A. ; INESC Microsistemas e Nanotecnologias (INESC MN), Rua Alves Redol 9, 1000-029 Lisbon, Portugal ; Germano, J. ; Ferreira, R. ; Cardoso, S.
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An integrated biosensor with magnetic tunnel juntions (MTJs) and spin valve (SV) sensor was used for 130 nm particle detection. A platform drives an external magnet generating an in-plane dc+ac magnetic field on the sensor at frequencies up to 375 Hz, 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 (130 nm in diameter) was performed using both sensors leading to a detection limit of 3×108 particles/ml for SV and 3×1010 particles/ml for MTJ.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 7 )

Date of Publication:

Apr 2008

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