11 May 2009 Microfabrication of nanowires-based GMR biosensor
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This study focuses on the development of current-perpendicular-to plane (CPP) Giant Magnetoresistance (GMR) of CoNiCu/Cu multilayered nanowire based microfluidic sensors for the detection of magnetic nanoparticles and fluids. The visible measurable variations in electrical voltage due to changes in external magnetic field are later to be monitored in microfluidic biosensor for the detection of toxicants in cells. An early prototype device was fabricated and tested using both an aqueous nonmagnetic medium (water) and a commercially available ferrofluid solution. A magnetic field of 0.01T caused a resistance change of 1.37% for ferrofluid, while a 1.1% GMR was recorded for the water baseline.
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R. Bellamkonda, R. Bellamkonda, T. John, T. John, B. Mathew, B. Mathew, M. DeCoster, M. DeCoster, H. Hegab, H. Hegab, J. Palmer, J. Palmer, D. Davis, D. Davis, "Microfabrication of nanowires-based GMR biosensor", Proc. SPIE 7318, Micro- and Nanotechnology Sensors, Systems, and Applications, 73181H (11 May 2009); doi: 10.1117/12.819076; https://doi.org/10.1117/12.819076

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