Rectangular cmos differential MAGFET biosensor for magnetic particle detection

A novel rectangular shape differential CMOS split-drain Hall Effect magnetic field-effect transistor (MAGFET) was designed and fabricated employing a CMOS 0.5 μm process. The detection and monitoring of single 2.8 μm diameter magnetic beads was successfully performed using this MAGFET design. Based...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2013-07, Vol.49 (7), p.4052-4055
Main Authors: Bowei Zhang, Zhenyu Li, Korman, Can E., Zaghloul, Mona E.
Format: Article
Language:English
Subjects:
CMOS
CMOS integrated circuits
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
magnetic beads
magnetic field-effect transistor (MAGFET)
Magnetic particles
Magnetic sensors
Magnetism
Materials science
Other topics in materials science
Physics
Sensitivity
Signal to noise ratio
SNR
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Summary:A novel rectangular shape differential CMOS split-drain Hall Effect magnetic field-effect transistor (MAGFET) was designed and fabricated employing a CMOS 0.5 μm process. The detection and monitoring of single 2.8 μm diameter magnetic beads was successfully performed using this MAGFET design. Based on the device modeling, simulation and the signal to noise ratio analysis, it was found that the optimal sensitivity can be achieved when the MAGFET channel width to length ratio is equal to 1.3. Further, it is shown through that when the MAGFET is scaled down, its SNR performance can sustain its peak, while being more sensitive to the geometry variations.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2013.2237893